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Finding the Fourth Proportional to 71,781.39, 107,672.49 and 63,920.34

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Solution

The fourth proportional to 71,781.39, 107,672.49 and 63,920.34 is: 95,880.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,781.39 : 107,672.49 = 63,920.34 : x
  2. Step 2: Convert to fraction form
    71,781.39/107,672.49 = 63,920.34/x
  3. Step 3: Cross multiply
    71,781.39x = 107,672.49 × 63,920.34
  4. Step 4: Simplify right side
    71,781.39x = 6,882,462,169.45
  5. Step 5: Solve for x
    x = 6,882,462,169.45/71,781.39
  6. Step 6: Final answer
    x = 95,880.87

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.