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Finding the Fourth Proportional to 457.21, 685.91 and 132.60

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Solution

The fourth proportional to 457.21, 685.91 and 132.60 is: 198.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    457.21 : 685.91 = 132.60 : x
  2. Step 2: Convert to fraction form
    457.21/685.91 = 132.60/x
  3. Step 3: Cross multiply
    457.21x = 685.91 × 132.60
  4. Step 4: Simplify right side
    457.21x = 90,951.67
  5. Step 5: Solve for x
    x = 90,951.67/457.21
  6. Step 6: Final answer
    x = 198.93

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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.