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Finding the Fourth Proportional to 21,691.92, 29,935.11 and 12,739.80

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Solution

The fourth proportional to 21,691.92, 29,935.11 and 12,739.80 is: 17,581.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,691.92 : 29,935.11 = 12,739.80 : x
  2. Step 2: Convert to fraction form
    21,691.92/29,935.11 = 12,739.80/x
  3. Step 3: Cross multiply
    21,691.92x = 29,935.11 × 12,739.80
  4. Step 4: Simplify right side
    21,691.92x = 381,367,314.38
  5. Step 5: Solve for x
    x = 381,367,314.38/21,691.92
  6. Step 6: Final answer
    x = 17,581.08

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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.