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Finding the Fourth Proportional to 391,333.52, 587,263.38 and 138,613.16

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Solution

The fourth proportional to 391,333.52, 587,263.38 and 138,613.16 is: 208,012.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,333.52 : 587,263.38 = 138,613.16 : x
  2. Step 2: Convert to fraction form
    391,333.52/587,263.38 = 138,613.16/x
  3. Step 3: Cross multiply
    391,333.52x = 587,263.38 × 138,613.16
  4. Step 4: Simplify right side
    391,333.52x = 81,402,432,854.08
  5. Step 5: Solve for x
    x = 81,402,432,854.08/391,333.52
  6. Step 6: Final answer
    x = 208,012.93

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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.