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Finding the Fourth Proportional to 757.28, 1,135.20 and 687.44

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Solution

The fourth proportional to 757.28, 1,135.20 and 687.44 is: 1,030.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    757.28 : 1,135.20 = 687.44 : x
  2. Step 2: Convert to fraction form
    757.28/1,135.20 = 687.44/x
  3. Step 3: Cross multiply
    757.28x = 1,135.20 × 687.44
  4. Step 4: Simplify right side
    757.28x = 780,381.89
  5. Step 5: Solve for x
    x = 780,381.89/757.28
  6. Step 6: Final answer
    x = 1,030.51

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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.