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Finding the Fourth Proportional to 391,420.86, 587,160.09 and 121,513.62

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Solution

The fourth proportional to 391,420.86, 587,160.09 and 121,513.62 is: 182,279.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,420.86 : 587,160.09 = 121,513.62 : x
  2. Step 2: Convert to fraction form
    391,420.86/587,160.09 = 121,513.62/x
  3. Step 3: Cross multiply
    391,420.86x = 587,160.09 × 121,513.62
  4. Step 4: Simplify right side
    391,420.86x = 71,347,948,055.43
  5. Step 5: Solve for x
    x = 71,347,948,055.43/391,420.86
  6. Step 6: Final answer
    x = 182,279.37

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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.