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Finding the Fourth Proportional to 1,691.40, 2,538.14 and 961.48

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Solution

The fourth proportional to 1,691.40, 2,538.14 and 961.48 is: 1,442.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,691.40 : 2,538.14 = 961.48 : x
  2. Step 2: Convert to fraction form
    1,691.40/2,538.14 = 961.48/x
  3. Step 3: Cross multiply
    1,691.40x = 2,538.14 × 961.48
  4. Step 4: Simplify right side
    1,691.40x = 2,440,370.85
  5. Step 5: Solve for x
    x = 2,440,370.85/1,691.40
  6. Step 6: Final answer
    x = 1,442.81

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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.