Home / 20,929.40-28,874.40-11,972.12

Finding the Fourth Proportional to 20,929.40, 28,874.40 and 11,972.12

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Solution

The fourth proportional to 20,929.40, 28,874.40 and 11,972.12 is: 16,516.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,929.40 : 28,874.40 = 11,972.12 : x
  2. Step 2: Convert to fraction form
    20,929.40/28,874.40 = 11,972.12/x
  3. Step 3: Cross multiply
    20,929.40x = 28,874.40 × 11,972.12
  4. Step 4: Simplify right side
    20,929.40x = 345,687,781.73
  5. Step 5: Solve for x
    x = 345,687,781.73/20,929.40
  6. Step 6: Final answer
    x = 16,516.85

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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.