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Finding the Fourth Proportional to 1,761.44, 2,640.57 and 665.51

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Solution

The fourth proportional to 1,761.44, 2,640.57 and 665.51 is: 997.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,761.44 : 2,640.57 = 665.51 : x
  2. Step 2: Convert to fraction form
    1,761.44/2,640.57 = 665.51/x
  3. Step 3: Cross multiply
    1,761.44x = 2,640.57 × 665.51
  4. Step 4: Simplify right side
    1,761.44x = 1,757,324.90
  5. Step 5: Solve for x
    x = 1,757,324.90/1,761.44
  6. Step 6: Final answer
    x = 997.66

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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.