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Finding the Fourth Proportional to 1,761.62, 2,640.13 and 720.43

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Solution

The fourth proportional to 1,761.62, 2,640.13 and 720.43 is: 1,079.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,761.62 : 2,640.13 = 720.43 : x
  2. Step 2: Convert to fraction form
    1,761.62/2,640.13 = 720.43/x
  3. Step 3: Cross multiply
    1,761.62x = 2,640.13 × 720.43
  4. Step 4: Simplify right side
    1,761.62x = 1,902,020.45
  5. Step 5: Solve for x
    x = 1,902,020.45/1,761.62
  6. Step 6: Final answer
    x = 1,079.70

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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.