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Finding the Fourth Proportional to 698.68, 1,043.18 and 691.76

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Solution

The fourth proportional to 698.68, 1,043.18 and 691.76 is: 1,032.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    698.68 : 1,043.18 = 691.76 : x
  2. Step 2: Convert to fraction form
    698.68/1,043.18 = 691.76/x
  3. Step 3: Cross multiply
    698.68x = 1,043.18 × 691.76
  4. Step 4: Simplify right side
    698.68x = 721,630.20
  5. Step 5: Solve for x
    x = 721,630.20/698.68
  6. Step 6: Final answer
    x = 1,032.85

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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.