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Finding the Fourth Proportional to 457.45, 685.26 and 213.23

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Solution

The fourth proportional to 457.45, 685.26 and 213.23 is: 319.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    457.45 : 685.26 = 213.23 : x
  2. Step 2: Convert to fraction form
    457.45/685.26 = 213.23/x
  3. Step 3: Cross multiply
    457.45x = 685.26 × 213.23
  4. Step 4: Simplify right side
    457.45x = 146,119.70
  5. Step 5: Solve for x
    x = 146,119.70/457.45
  6. Step 6: Final answer
    x = 319.42

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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.