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Finding the Fourth Proportional to 136,394.39, 188,207.71 and 78,248.12

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Solution

The fourth proportional to 136,394.39, 188,207.71 and 78,248.12 is: 107,972.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    136,394.39 : 188,207.71 = 78,248.12 : x
  2. Step 2: Convert to fraction form
    136,394.39/188,207.71 = 78,248.12/x
  3. Step 3: Cross multiply
    136,394.39x = 188,207.71 × 78,248.12
  4. Step 4: Simplify right side
    136,394.39x = 14,726,898,340.35
  5. Step 5: Solve for x
    x = 14,726,898,340.35/136,394.39
  6. Step 6: Final answer
    x = 107,972.90

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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.