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Finding the Fourth Proportional to 1,761.42, 2,640.27 and 665.31

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Solution

The fourth proportional to 1,761.42, 2,640.27 and 665.31 is: 997.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,761.42 : 2,640.27 = 665.31 : x
  2. Step 2: Convert to fraction form
    1,761.42/2,640.27 = 665.31/x
  3. Step 3: Cross multiply
    1,761.42x = 2,640.27 × 665.31
  4. Step 4: Simplify right side
    1,761.42x = 1,756,598.03
  5. Step 5: Solve for x
    x = 1,756,598.03/1,761.42
  6. Step 6: Final answer
    x = 997.26

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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.