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Finding the Fourth Proportional to 721.18, 992.25 and 636.82

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Solution

The fourth proportional to 721.18, 992.25 and 636.82 is: 876.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.18 : 992.25 = 636.82 : x
  2. Step 2: Convert to fraction form
    721.18/992.25 = 636.82/x
  3. Step 3: Cross multiply
    721.18x = 992.25 × 636.82
  4. Step 4: Simplify right side
    721.18x = 631,884.65
  5. Step 5: Solve for x
    x = 631,884.65/721.18
  6. Step 6: Final answer
    x = 876.18

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.