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Finding the Fourth Proportional to 721.15, 994.71 and 574.13

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Solution

The fourth proportional to 721.15, 994.71 and 574.13 is: 791.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.15 : 994.71 = 574.13 : x
  2. Step 2: Convert to fraction form
    721.15/994.71 = 574.13/x
  3. Step 3: Cross multiply
    721.15x = 994.71 × 574.13
  4. Step 4: Simplify right side
    721.15x = 571,092.85
  5. Step 5: Solve for x
    x = 571,092.85/721.15
  6. Step 6: Final answer
    x = 791.93

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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.