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Finding the Fourth Proportional to 753.10, 1,128.97 and 387.42

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Solution

The fourth proportional to 753.10, 1,128.97 and 387.42 is: 580.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    753.10 : 1,128.97 = 387.42 : x
  2. Step 2: Convert to fraction form
    753.10/1,128.97 = 387.42/x
  3. Step 3: Cross multiply
    753.10x = 1,128.97 × 387.42
  4. Step 4: Simplify right side
    753.10x = 437,385.56
  5. Step 5: Solve for x
    x = 437,385.56/753.10
  6. Step 6: Final answer
    x = 580.78

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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.