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Finding the Fourth Proportional to 391,514.31, 587,358.99 and 125,290.80

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Solution

The fourth proportional to 391,514.31, 587,358.99 and 125,290.80 is: 187,964.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,514.31 : 587,358.99 = 125,290.80 : x
  2. Step 2: Convert to fraction form
    391,514.31/587,358.99 = 125,290.80/x
  3. Step 3: Cross multiply
    391,514.31x = 587,358.99 × 125,290.80
  4. Step 4: Simplify right side
    391,514.31x = 73,590,677,744.29
  5. Step 5: Solve for x
    x = 73,590,677,744.29/391,514.31
  6. Step 6: Final answer
    x = 187,964.21

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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.