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Finding the Fourth Proportional to 1,679.47, 2,517.59 and 691.68

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Solution

The fourth proportional to 1,679.47, 2,517.59 and 691.68 is: 1,036.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,679.47 : 2,517.59 = 691.68 : x
  2. Step 2: Convert to fraction form
    1,679.47/2,517.59 = 691.68/x
  3. Step 3: Cross multiply
    1,679.47x = 2,517.59 × 691.68
  4. Step 4: Simplify right side
    1,679.47x = 1,741,361.09
  5. Step 5: Solve for x
    x = 1,741,361.09/1,679.47
  6. Step 6: Final answer
    x = 1,036.85

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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.