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Finding the Fourth Proportional to 457.38, 685.93 and 197.31

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Solution

The fourth proportional to 457.38, 685.93 and 197.31 is: 295.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    457.38 : 685.93 = 197.31 : x
  2. Step 2: Convert to fraction form
    457.38/685.93 = 197.31/x
  3. Step 3: Cross multiply
    457.38x = 685.93 × 197.31
  4. Step 4: Simplify right side
    457.38x = 135,340.85
  5. Step 5: Solve for x
    x = 135,340.85/457.38
  6. Step 6: Final answer
    x = 295.90

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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.