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Finding the Fourth Proportional to 391,769.74, 587,654.56 and 258,618.80

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Solution

The fourth proportional to 391,769.74, 587,654.56 and 258,618.80 is: 387,928.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,769.74 : 587,654.56 = 258,618.80 : x
  2. Step 2: Convert to fraction form
    391,769.74/587,654.56 = 258,618.80/x
  3. Step 3: Cross multiply
    391,769.74x = 587,654.56 × 258,618.80
  4. Step 4: Simplify right side
    391,769.74x = 151,978,517,121.73
  5. Step 5: Solve for x
    x = 151,978,517,121.73/391,769.74
  6. Step 6: Final answer
    x = 387,928.17

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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.