Home / 20,691.39-28,520.91-13,974.87

Finding the Fourth Proportional to 20,691.39, 28,520.91 and 13,974.87

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Solution

The fourth proportional to 20,691.39, 28,520.91 and 13,974.87 is: 19,262.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,691.39 : 28,520.91 = 13,974.87 : x
  2. Step 2: Convert to fraction form
    20,691.39/28,520.91 = 13,974.87/x
  3. Step 3: Cross multiply
    20,691.39x = 28,520.91 × 13,974.87
  4. Step 4: Simplify right side
    20,691.39x = 398,576,009.53
  5. Step 5: Solve for x
    x = 398,576,009.53/20,691.39
  6. Step 6: Final answer
    x = 19,262.89

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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.