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Finding the Fourth Proportional to 1,229.22, 1,691.82 and 979.74

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Solution

The fourth proportional to 1,229.22, 1,691.82 and 979.74 is: 1,348.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,229.22 : 1,691.82 = 979.74 : x
  2. Step 2: Convert to fraction form
    1,229.22/1,691.82 = 979.74/x
  3. Step 3: Cross multiply
    1,229.22x = 1,691.82 × 979.74
  4. Step 4: Simplify right side
    1,229.22x = 1,657,543.73
  5. Step 5: Solve for x
    x = 1,657,543.73/1,229.22
  6. Step 6: Final answer
    x = 1,348.45

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.