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Finding the Fourth Proportional to 574.70, 791.33 and 491.61

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Solution

The fourth proportional to 574.70, 791.33 and 491.61 is: 676.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    574.70 : 791.33 = 491.61 : x
  2. Step 2: Convert to fraction form
    574.70/791.33 = 491.61/x
  3. Step 3: Cross multiply
    574.70x = 791.33 × 491.61
  4. Step 4: Simplify right side
    574.70x = 389,025.74
  5. Step 5: Solve for x
    x = 389,025.74/574.70
  6. Step 6: Final answer
    x = 676.92

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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.