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Finding the Fourth Proportional to 457.28, 686.51 and 213.96

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Solution

The fourth proportional to 457.28, 686.51 and 213.96 is: 321.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    457.28 : 686.51 = 213.96 : x
  2. Step 2: Convert to fraction form
    457.28/686.51 = 213.96/x
  3. Step 3: Cross multiply
    457.28x = 686.51 × 213.96
  4. Step 4: Simplify right side
    457.28x = 146,884.61
  5. Step 5: Solve for x
    x = 146,884.61/457.28
  6. Step 6: Final answer
    x = 321.22

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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.