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Finding the Fourth Proportional to 20,691.52, 28,504.12 and 15,377.12

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Solution

The fourth proportional to 20,691.52, 28,504.12 and 15,377.12 is: 21,183.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,691.52 : 28,504.12 = 15,377.12 : x
  2. Step 2: Convert to fraction form
    20,691.52/28,504.12 = 15,377.12/x
  3. Step 3: Cross multiply
    20,691.52x = 28,504.12 × 15,377.12
  4. Step 4: Simplify right side
    20,691.52x = 438,311,273.73
  5. Step 5: Solve for x
    x = 438,311,273.73/20,691.52
  6. Step 6: Final answer
    x = 21,183.14

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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.