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Finding the Fourth Proportional to 752.76, 1,128.54 and 387.12

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Solution

The fourth proportional to 752.76, 1,128.54 and 387.12 is: 580.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    752.76 : 1,128.54 = 387.12 : x
  2. Step 2: Convert to fraction form
    752.76/1,128.54 = 387.12/x
  3. Step 3: Cross multiply
    752.76x = 1,128.54 × 387.12
  4. Step 4: Simplify right side
    752.76x = 436,880.40
  5. Step 5: Solve for x
    x = 436,880.40/752.76
  6. Step 6: Final answer
    x = 580.37

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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.