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Finding the Fourth Proportional to 752.58, 1,129.17 and 387.18

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Solution

The fourth proportional to 752.58, 1,129.17 and 387.18 is: 580.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    752.58 : 1,129.17 = 387.18 : x
  2. Step 2: Convert to fraction form
    752.58/1,129.17 = 387.18/x
  3. Step 3: Cross multiply
    752.58x = 1,129.17 × 387.18
  4. Step 4: Simplify right side
    752.58x = 437,192.04
  5. Step 5: Solve for x
    x = 437,192.04/752.58
  6. Step 6: Final answer
    x = 580.92

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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.