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Finding the Fourth Proportional to 457.56, 686.43 and 214.11

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Solution

The fourth proportional to 457.56, 686.43 and 214.11 is: 321.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    457.56 : 686.43 = 214.11 : x
  2. Step 2: Convert to fraction form
    457.56/686.43 = 214.11/x
  3. Step 3: Cross multiply
    457.56x = 686.43 × 214.11
  4. Step 4: Simplify right side
    457.56x = 146,971.53
  5. Step 5: Solve for x
    x = 146,971.53/457.56
  6. Step 6: Final answer
    x = 321.21

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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.