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Finding the Fourth Proportional to 10,542.80, 15,814.20 and 9,117.20

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Solution

The fourth proportional to 10,542.80, 15,814.20 and 9,117.20 is: 13,675.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,542.80 : 15,814.20 = 9,117.20 : x
  2. Step 2: Convert to fraction form
    10,542.80/15,814.20 = 9,117.20/x
  3. Step 3: Cross multiply
    10,542.80x = 15,814.20 × 9,117.20
  4. Step 4: Simplify right side
    10,542.80x = 144,181,224.24
  5. Step 5: Solve for x
    x = 144,181,224.24/10,542.80
  6. Step 6: Final answer
    x = 13,675.80

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Double scale
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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.