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Finding the Fourth Proportional to 457.28, 685.98 and 132.70

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Solution

The fourth proportional to 457.28, 685.98 and 132.70 is: 199.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    457.28 : 685.98 = 132.70 : x
  2. Step 2: Convert to fraction form
    457.28/685.98 = 132.70/x
  3. Step 3: Cross multiply
    457.28x = 685.98 × 132.70
  4. Step 4: Simplify right side
    457.28x = 91,029.55
  5. Step 5: Solve for x
    x = 91,029.55/457.28
  6. Step 6: Final answer
    x = 199.07

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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.