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Finding the Fourth Proportional to 391,387.95, 587,118.78 and 125,085.20

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Solution

The fourth proportional to 391,387.95, 587,118.78 and 125,085.20 is: 187,639.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,387.95 : 587,118.78 = 125,085.20 : x
  2. Step 2: Convert to fraction form
    391,387.95/587,118.78 = 125,085.20/x
  3. Step 3: Cross multiply
    391,387.95x = 587,118.78 × 125,085.20
  4. Step 4: Simplify right side
    391,387.95x = 73,439,867,084.46
  5. Step 5: Solve for x
    x = 73,439,867,084.46/391,387.95
  6. Step 6: Final answer
    x = 187,639.57

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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.