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Finding the Fourth Proportional to 752.88, 1,128.11 and 615.99

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Solution

The fourth proportional to 752.88, 1,128.11 and 615.99 is: 922.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    752.88 : 1,128.11 = 615.99 : x
  2. Step 2: Convert to fraction form
    752.88/1,128.11 = 615.99/x
  3. Step 3: Cross multiply
    752.88x = 1,128.11 × 615.99
  4. Step 4: Simplify right side
    752.88x = 694,901.40
  5. Step 5: Solve for x
    x = 694,901.40/752.88
  6. Step 6: Final answer
    x = 922.99

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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.