Home / 20,691.20-28,551.68-12,306.56

Finding the Fourth Proportional to 20,691.20, 28,551.68 and 12,306.56

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Solution

The fourth proportional to 20,691.20, 28,551.68 and 12,306.56 is: 16,981.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,691.20 : 28,551.68 = 12,306.56 : x
  2. Step 2: Convert to fraction form
    20,691.20/28,551.68 = 12,306.56/x
  3. Step 3: Cross multiply
    20,691.20x = 28,551.68 × 12,306.56
  4. Step 4: Simplify right side
    20,691.20x = 351,372,963.02
  5. Step 5: Solve for x
    x = 351,372,963.02/20,691.20
  6. Step 6: Final answer
    x = 16,981.76

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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.