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Finding the Fourth Proportional to 391,431.80, 587,243.70 and 181,025.40

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Solution

The fourth proportional to 391,431.80, 587,243.70 and 181,025.40 is: 271,582.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,431.80 : 587,243.70 = 181,025.40 : x
  2. Step 2: Convert to fraction form
    391,431.80/587,243.70 = 181,025.40/x
  3. Step 3: Cross multiply
    391,431.80x = 587,243.70 × 181,025.40
  4. Step 4: Simplify right side
    391,431.80x = 106,306,025,689.98
  5. Step 5: Solve for x
    x = 106,306,025,689.98/391,431.80
  6. Step 6: Final answer
    x = 271,582.50

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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.