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Finding the Fourth Proportional to 391,491.60, 587,237.40 and 387,805.20

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Solution

The fourth proportional to 391,491.60, 587,237.40 and 387,805.20 is: 581,707.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,491.60 : 587,237.40 = 387,805.20 : x
  2. Step 2: Convert to fraction form
    391,491.60/587,237.40 = 387,805.20/x
  3. Step 3: Cross multiply
    391,491.60x = 587,237.40 × 387,805.20
  4. Step 4: Simplify right side
    391,491.60x = 227,733,717,354.48
  5. Step 5: Solve for x
    x = 227,733,717,354.48/391,491.60
  6. Step 6: Final answer
    x = 581,707.80

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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.