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Finding the Fourth Proportional to 125,078.31, 172,606.35 and 68,489.70

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Solution

The fourth proportional to 125,078.31, 172,606.35 and 68,489.70 is: 94,514.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    125,078.31 : 172,606.35 = 68,489.70 : x
  2. Step 2: Convert to fraction form
    125,078.31/172,606.35 = 68,489.70/x
  3. Step 3: Cross multiply
    125,078.31x = 172,606.35 × 68,489.70
  4. Step 4: Simplify right side
    125,078.31x = 11,821,757,129.60
  5. Step 5: Solve for x
    x = 11,821,757,129.60/125,078.31
  6. Step 6: Final answer
    x = 94,514.85

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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.