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Finding the Fourth Proportional to 754.20, 1,135.98 and 687.78

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Solution

The fourth proportional to 754.20, 1,135.98 and 687.78 is: 1,035.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    754.20 : 1,135.98 = 687.78 : x
  2. Step 2: Convert to fraction form
    754.20/1,135.98 = 687.78/x
  3. Step 3: Cross multiply
    754.20x = 1,135.98 × 687.78
  4. Step 4: Simplify right side
    754.20x = 781,304.32
  5. Step 5: Solve for x
    x = 781,304.32/754.20
  6. Step 6: Final answer
    x = 1,035.94

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.