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Finding the Fourth Proportional to 752.06, 1,128.31 and 387.11

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Solution

The fourth proportional to 752.06, 1,128.31 and 387.11 is: 580.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    752.06 : 1,128.31 = 387.11 : x
  2. Step 2: Convert to fraction form
    752.06/1,128.31 = 387.11/x
  3. Step 3: Cross multiply
    752.06x = 1,128.31 × 387.11
  4. Step 4: Simplify right side
    752.06x = 436,781.94
  5. Step 5: Solve for x
    x = 436,781.94/752.06
  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.