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Finding the Fourth Proportional to 391,487.20, 587,461.20 and 142,194.40

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Solution

The fourth proportional to 391,487.20, 587,461.20 and 142,194.40 is: 213,375.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,487.20 : 587,461.20 = 142,194.40 : x
  2. Step 2: Convert to fraction form
    391,487.20/587,461.20 = 142,194.40/x
  3. Step 3: Cross multiply
    391,487.20x = 587,461.20 × 142,194.40
  4. Step 4: Simplify right side
    391,487.20x = 83,533,692,857.28
  5. Step 5: Solve for x
    x = 83,533,692,857.28/391,487.20
  6. Step 6: Final answer
    x = 213,375.28

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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.