# Geometric progression

Fill 4 numbers between 4 and -12500 to form geometric progression.

a1:  -20
a2:  100
a3:  -500
a4:  2500

### Step-by-step explanation:

${a}_{2}=4\cdot \left(-5\right)\cdot \left(-5\right)=100$
${a}_{3}=4\cdot \left(-5\right)\cdot \left(-5\right)\cdot \left(-5\right)=-500$
${a}_{4}=4\cdot \left(-5\right)\cdot \left(-5\right)\cdot \left(-5\right)\cdot \left(-5\right)=2500$

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