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Finding the Fourth Proportional to 1,761.80, 2,642.49 and 721.08

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Solution

The fourth proportional to 1,761.80, 2,642.49 and 721.08 is: 1,081.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,761.80 : 2,642.49 = 721.08 : x
  2. Step 2: Convert to fraction form
    1,761.80/2,642.49 = 721.08/x
  3. Step 3: Cross multiply
    1,761.80x = 2,642.49 × 721.08
  4. Step 4: Simplify right side
    1,761.80x = 1,905,446.69
  5. Step 5: Solve for x
    x = 1,905,446.69/1,761.80
  6. Step 6: Final answer
    x = 1,081.54

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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.