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Finding the Fourth Proportional to 391,328.52, 587,255.88 and 138,608.16

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Solution

The fourth proportional to 391,328.52, 587,255.88 and 138,608.16 is: 208,005.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,328.52 : 587,255.88 = 138,608.16 : x
  2. Step 2: Convert to fraction form
    391,328.52/587,255.88 = 138,608.16/x
  3. Step 3: Cross multiply
    391,328.52x = 587,255.88 × 138,608.16
  4. Step 4: Simplify right side
    391,328.52x = 81,398,456,975.98
  5. Step 5: Solve for x
    x = 81,398,456,975.98/391,328.52
  6. Step 6: Final answer
    x = 208,005.43

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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.