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Finding the Fourth Proportional to 1,115.43, 1,671.72 and 499.11

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Solution

The fourth proportional to 1,115.43, 1,671.72 and 499.11 is: 748.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,115.43 : 1,671.72 = 499.11 : x
  2. Step 2: Convert to fraction form
    1,115.43/1,671.72 = 499.11/x
  3. Step 3: Cross multiply
    1,115.43x = 1,671.72 × 499.11
  4. Step 4: Simplify right side
    1,115.43x = 834,372.17
  5. Step 5: Solve for x
    x = 834,372.17/1,115.43
  6. Step 6: Final answer
    x = 748.03

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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.