Home / 20,781.76-31,153.20-9,101.92

Finding the Fourth Proportional to 20,781.76, 31,153.20 and 9,101.92

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Solution

The fourth proportional to 20,781.76, 31,153.20 and 9,101.92 is: 13,644.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,781.76 : 31,153.20 = 9,101.92 : x
  2. Step 2: Convert to fraction form
    20,781.76/31,153.20 = 9,101.92/x
  3. Step 3: Cross multiply
    20,781.76x = 31,153.20 × 9,101.92
  4. Step 4: Simplify right side
    20,781.76x = 283,553,934.14
  5. Step 5: Solve for x
    x = 283,553,934.14/20,781.76
  6. Step 6: Final answer
    x = 13,644.37

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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.