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Finding the Fourth Proportional to 391,605.20, 587,407.80 and 371,387.60

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Solution

The fourth proportional to 391,605.20, 587,407.80 and 371,387.60 is: 557,081.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,605.20 : 587,407.80 = 371,387.60 : x
  2. Step 2: Convert to fraction form
    391,605.20/587,407.80 = 371,387.60/x
  3. Step 3: Cross multiply
    391,605.20x = 587,407.80 × 371,387.60
  4. Step 4: Simplify right side
    391,605.20x = 218,155,973,063.28
  5. Step 5: Solve for x
    x = 218,155,973,063.28/391,605.20
  6. Step 6: Final answer
    x = 557,081.40

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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.