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Finding the Fourth Proportional to 8,958.57, 12,334.59 and 8,128.20

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Solution

The fourth proportional to 8,958.57, 12,334.59 and 8,128.20 is: 11,191.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,958.57 : 12,334.59 = 8,128.20 : x
  2. Step 2: Convert to fraction form
    8,958.57/12,334.59 = 8,128.20/x
  3. Step 3: Cross multiply
    8,958.57x = 12,334.59 × 8,128.20
  4. Step 4: Simplify right side
    8,958.57x = 100,258,014.44
  5. Step 5: Solve for x
    x = 100,258,014.44/8,958.57
  6. Step 6: Final answer
    x = 11,191.30

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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.