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Finding the Fourth Proportional to 391,389.95, 587,121.78 and 125,087.20

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Solution

The fourth proportional to 391,389.95, 587,121.78 and 125,087.20 is: 187,642.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,389.95 : 587,121.78 = 125,087.20 : x
  2. Step 2: Convert to fraction form
    391,389.95/587,121.78 = 125,087.20/x
  3. Step 3: Cross multiply
    391,389.95x = 587,121.78 × 125,087.20
  4. Step 4: Simplify right side
    391,389.95x = 73,441,419,519.22
  5. Step 5: Solve for x
    x = 73,441,419,519.22/391,389.95
  6. Step 6: Final answer
    x = 187,642.58

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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.