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Finding the Fourth Proportional to 39,807.68, 54,934.17 and 21,658.95

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Solution

The fourth proportional to 39,807.68, 54,934.17 and 21,658.95 is: 29,889.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,807.68 : 54,934.17 = 21,658.95 : x
  2. Step 2: Convert to fraction form
    39,807.68/54,934.17 = 21,658.95/x
  3. Step 3: Cross multiply
    39,807.68x = 54,934.17 × 21,658.95
  4. Step 4: Simplify right side
    39,807.68x = 1,189,816,441.32
  5. Step 5: Solve for x
    x = 1,189,816,441.32/39,807.68
  6. Step 6: Final answer
    x = 29,889.12

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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.