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Finding the Fourth Proportional to 2,151.96, 3,227.88 and 691.20

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Solution

The fourth proportional to 2,151.96, 3,227.88 and 691.20 is: 1,036.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,151.96 : 3,227.88 = 691.20 : x
  2. Step 2: Convert to fraction form
    2,151.96/3,227.88 = 691.20/x
  3. Step 3: Cross multiply
    2,151.96x = 3,227.88 × 691.20
  4. Step 4: Simplify right side
    2,151.96x = 2,231,110.66
  5. Step 5: Solve for x
    x = 2,231,110.66/2,151.96
  6. Step 6: Final answer
    x = 1,036.78

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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.