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Finding the Fourth Proportional to 138,601.80, 207,756.90 and 54,329.40

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Solution

The fourth proportional to 138,601.80, 207,756.90 and 54,329.40 is: 81,436.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,601.80 : 207,756.90 = 54,329.40 : x
  2. Step 2: Convert to fraction form
    138,601.80/207,756.90 = 54,329.40/x
  3. Step 3: Cross multiply
    138,601.80x = 207,756.90 × 54,329.40
  4. Step 4: Simplify right side
    138,601.80x = 11,287,307,722.86
  5. Step 5: Solve for x
    x = 11,287,307,722.86/138,601.80
  6. Step 6: Final answer
    x = 81,436.95

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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.