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Finding the Fourth Proportional to 10,358.80, 15,538.20 and 6,640.90

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Solution

The fourth proportional to 10,358.80, 15,538.20 and 6,640.90 is: 9,961.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,358.80 : 15,538.20 = 6,640.90 : x
  2. Step 2: Convert to fraction form
    10,358.80/15,538.20 = 6,640.90/x
  3. Step 3: Cross multiply
    10,358.80x = 15,538.20 × 6,640.90
  4. Step 4: Simplify right side
    10,358.80x = 103,187,632.38
  5. Step 5: Solve for x
    x = 103,187,632.38/10,358.80
  6. Step 6: Final answer
    x = 9,961.35

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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.