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Finding the Fourth Proportional to 1,211.62, 1,671.92 and 680.38

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Solution

The fourth proportional to 1,211.62, 1,671.92 and 680.38 is: 938.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,211.62 : 1,671.92 = 680.38 : x
  2. Step 2: Convert to fraction form
    1,211.62/1,671.92 = 680.38/x
  3. Step 3: Cross multiply
    1,211.62x = 1,671.92 × 680.38
  4. Step 4: Simplify right side
    1,211.62x = 1,137,540.93
  5. Step 5: Solve for x
    x = 1,137,540.93/1,211.62
  6. Step 6: Final answer
    x = 938.86

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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.