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Finding the Fourth Proportional to 391,448.20, 587,402.70 and 142,097.80

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Solution

The fourth proportional to 391,448.20, 587,402.70 and 142,097.80 is: 213,230.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,448.20 : 587,402.70 = 142,097.80 : x
  2. Step 2: Convert to fraction form
    391,448.20/587,402.70 = 142,097.80/x
  3. Step 3: Cross multiply
    391,448.20x = 587,402.70 × 142,097.80
  4. Step 4: Simplify right side
    391,448.20x = 83,468,631,384.06
  5. Step 5: Solve for x
    x = 83,468,631,384.06/391,448.20
  6. Step 6: Final answer
    x = 213,230.34

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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.