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Finding the Fourth Proportional to 258,403.44, 387,608.16 and 68,862.72

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Solution

The fourth proportional to 258,403.44, 387,608.16 and 68,862.72 is: 103,294.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,403.44 : 387,608.16 = 68,862.72 : x
  2. Step 2: Convert to fraction form
    258,403.44/387,608.16 = 68,862.72/x
  3. Step 3: Cross multiply
    258,403.44x = 387,608.16 × 68,862.72
  4. Step 4: Simplify right side
    258,403.44x = 26,691,752,191.80
  5. Step 5: Solve for x
    x = 26,691,752,191.80/258,403.44
  6. Step 6: Final answer
    x = 103,294.88

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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.