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Finding the Fourth Proportional to 752.52, 1,128.87 and 423.42

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Solution

The fourth proportional to 752.52, 1,128.87 and 423.42 is: 635.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    752.52 : 1,128.87 = 423.42 : x
  2. Step 2: Convert to fraction form
    752.52/1,128.87 = 423.42/x
  3. Step 3: Cross multiply
    752.52x = 1,128.87 × 423.42
  4. Step 4: Simplify right side
    752.52x = 477,986.14
  5. Step 5: Solve for x
    x = 477,986.14/752.52
  6. Step 6: Final answer
    x = 635.18

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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.