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Finding the Fourth Proportional to 457.15, 685.71 and 212.92

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Solution

The fourth proportional to 457.15, 685.71 and 212.92 is: 319.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    457.15 : 685.71 = 212.92 : x
  2. Step 2: Convert to fraction form
    457.15/685.71 = 212.92/x
  3. Step 3: Cross multiply
    457.15x = 685.71 × 212.92
  4. Step 4: Simplify right side
    457.15x = 146,001.37
  5. Step 5: Solve for x
    x = 146,001.37/457.15
  6. Step 6: Final answer
    x = 319.37

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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.