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Finding the Fourth Proportional to 391,428.91, 587,235.32 and 121,543.23

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Solution

The fourth proportional to 391,428.91, 587,235.32 and 121,543.23 is: 182,343.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,428.91 : 587,235.32 = 121,543.23 : x
  2. Step 2: Convert to fraction form
    391,428.91/587,235.32 = 121,543.23/x
  3. Step 3: Cross multiply
    391,428.91x = 587,235.32 × 121,543.23
  4. Step 4: Simplify right side
    391,428.91x = 71,374,479,613.09
  5. Step 5: Solve for x
    x = 71,374,479,613.09/391,428.91
  6. Step 6: Final answer
    x = 182,343.41

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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.