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Finding the Fourth Proportional to 1,125.38, 1,687.26 and 691.64

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Solution

The fourth proportional to 1,125.38, 1,687.26 and 691.64 is: 1,036.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,125.38 : 1,687.26 = 691.64 : x
  2. Step 2: Convert to fraction form
    1,125.38/1,687.26 = 691.64/x
  3. Step 3: Cross multiply
    1,125.38x = 1,687.26 × 691.64
  4. Step 4: Simplify right side
    1,125.38x = 1,166,976.51
  5. Step 5: Solve for x
    x = 1,166,976.51/1,125.38
  6. Step 6: Final answer
    x = 1,036.96

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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.