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Finding the Fourth Proportional to 258,634.08, 387,951.12 and 71,640.72

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Solution

The fourth proportional to 258,634.08, 387,951.12 and 71,640.72 is: 107,461.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,634.08 : 387,951.12 = 71,640.72 : x
  2. Step 2: Convert to fraction form
    258,634.08/387,951.12 = 71,640.72/x
  3. Step 3: Cross multiply
    258,634.08x = 387,951.12 × 71,640.72
  4. Step 4: Simplify right side
    258,634.08x = 27,793,097,561.61
  5. Step 5: Solve for x
    x = 27,793,097,561.61/258,634.08
  6. Step 6: Final answer
    x = 107,461.08

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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.