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Finding the Fourth Proportional to 391,411.29, 587,152.80 and 121,540.98

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Solution

The fourth proportional to 391,411.29, 587,152.80 and 121,540.98 is: 182,322.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,411.29 : 587,152.80 = 121,540.98 : x
  2. Step 2: Convert to fraction form
    391,411.29/587,152.80 = 121,540.98/x
  3. Step 3: Cross multiply
    391,411.29x = 587,152.80 × 121,540.98
  4. Step 4: Simplify right side
    391,411.29x = 71,363,126,721.74
  5. Step 5: Solve for x
    x = 71,363,126,721.74/391,411.29
  6. Step 6: Final answer
    x = 182,322.61

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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.