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Finding the Fourth Proportional to 1,761.39, 2,640.78 and 871.41

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Solution

The fourth proportional to 1,761.39, 2,640.78 and 871.41 is: 1,306.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,761.39 : 2,640.78 = 871.41 : x
  2. Step 2: Convert to fraction form
    1,761.39/2,640.78 = 871.41/x
  3. Step 3: Cross multiply
    1,761.39x = 2,640.78 × 871.41
  4. Step 4: Simplify right side
    1,761.39x = 2,301,202.10
  5. Step 5: Solve for x
    x = 2,301,202.10/1,761.39
  6. Step 6: Final answer
    x = 1,306.47

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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.