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Finding the Fourth Proportional to 1,098.11, 1,642.15 and 820.66

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Solution

The fourth proportional to 1,098.11, 1,642.15 and 820.66 is: 1,227.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,098.11 : 1,642.15 = 820.66 : x
  2. Step 2: Convert to fraction form
    1,098.11/1,642.15 = 820.66/x
  3. Step 3: Cross multiply
    1,098.11x = 1,642.15 × 820.66
  4. Step 4: Simplify right side
    1,098.11x = 1,347,646.82
  5. Step 5: Solve for x
    x = 1,347,646.82/1,098.11
  6. Step 6: Final answer
    x = 1,227.24

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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.