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Finding the Fourth Proportional to 681.30, 1,015.07 and 671.78

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Solution

The fourth proportional to 681.30, 1,015.07 and 671.78 is: 1,000.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.30 : 1,015.07 = 671.78 : x
  2. Step 2: Convert to fraction form
    681.30/1,015.07 = 671.78/x
  3. Step 3: Cross multiply
    681.30x = 1,015.07 × 671.78
  4. Step 4: Simplify right side
    681.30x = 681,902.90
  5. Step 5: Solve for x
    x = 681,902.90/681.30
  6. Step 6: Final answer
    x = 1,000.88

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.