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Finding the Fourth Proportional to 138,746.80, 208,120.20 and 82,613.80

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Solution

The fourth proportional to 138,746.80, 208,120.20 and 82,613.80 is: 123,920.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,746.80 : 208,120.20 = 82,613.80 : x
  2. Step 2: Convert to fraction form
    138,746.80/208,120.20 = 82,613.80/x
  3. Step 3: Cross multiply
    138,746.80x = 208,120.20 × 82,613.80
  4. Step 4: Simplify right side
    138,746.80x = 17,193,600,578.76
  5. Step 5: Solve for x
    x = 17,193,600,578.76/138,746.80
  6. Step 6: Final answer
    x = 123,920.70

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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.