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Finding the Fourth Proportional to 391,710.92, 587,580.30 and 125,436.84

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Solution

The fourth proportional to 391,710.92, 587,580.30 and 125,436.84 is: 188,159.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,710.92 : 587,580.30 = 125,436.84 : x
  2. Step 2: Convert to fraction form
    391,710.92/587,580.30 = 125,436.84/x
  3. Step 3: Cross multiply
    391,710.92x = 587,580.30 × 125,436.84
  4. Step 4: Simplify right side
    391,710.92x = 73,704,216,078.25
  5. Step 5: Solve for x
    x = 73,704,216,078.25/391,710.92
  6. Step 6: Final answer
    x = 188,159.72

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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.