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Finding the Fourth Proportional to 457.26, 685.90 and 213.72

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Solution

The fourth proportional to 457.26, 685.90 and 213.72 is: 320.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    457.26 : 685.90 = 213.72 : x
  2. Step 2: Convert to fraction form
    457.26/685.90 = 213.72/x
  3. Step 3: Cross multiply
    457.26x = 685.90 × 213.72
  4. Step 4: Simplify right side
    457.26x = 146,590.55
  5. Step 5: Solve for x
    x = 146,590.55/457.26
  6. Step 6: Final answer
    x = 320.58

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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.