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Finding the Fourth Proportional to 1,761.21, 2,642.28 and 665.58

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Solution

The fourth proportional to 1,761.21, 2,642.28 and 665.58 is: 998.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,761.21 : 2,642.28 = 665.58 : x
  2. Step 2: Convert to fraction form
    1,761.21/2,642.28 = 665.58/x
  3. Step 3: Cross multiply
    1,761.21x = 2,642.28 × 665.58
  4. Step 4: Simplify right side
    1,761.21x = 1,758,648.72
  5. Step 5: Solve for x
    x = 1,758,648.72/1,761.21
  6. Step 6: Final answer
    x = 998.55

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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.