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Finding the Fourth Proportional to 10,607.20, 15,910.80 and 8,638.90

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Solution

The fourth proportional to 10,607.20, 15,910.80 and 8,638.90 is: 12,958.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,607.20 : 15,910.80 = 8,638.90 : x
  2. Step 2: Convert to fraction form
    10,607.20/15,910.80 = 8,638.90/x
  3. Step 3: Cross multiply
    10,607.20x = 15,910.80 × 8,638.90
  4. Step 4: Simplify right side
    10,607.20x = 137,451,810.12
  5. Step 5: Solve for x
    x = 137,451,810.12/10,607.20
  6. Step 6: Final answer
    x = 12,958.35

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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.