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Finding the Fourth Proportional to 261,321.34, 391,487.49 and 154,385.56

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Solution

The fourth proportional to 261,321.34, 391,487.49 and 154,385.56 is: 231,286.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,321.34 : 391,487.49 = 154,385.56 : x
  2. Step 2: Convert to fraction form
    261,321.34/391,487.49 = 154,385.56/x
  3. Step 3: Cross multiply
    261,321.34x = 391,487.49 × 154,385.56
  4. Step 4: Simplify right side
    261,321.34x = 60,440,015,376.64
  5. Step 5: Solve for x
    x = 60,440,015,376.64/261,321.34
  6. Step 6: Final answer
    x = 231,286.18

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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.