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Finding the Fourth Proportional to 316.62, 437.18 and 218.61

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Solution

The fourth proportional to 316.62, 437.18 and 218.61 is: 301.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    316.62 : 437.18 = 218.61 : x
  2. Step 2: Convert to fraction form
    316.62/437.18 = 218.61/x
  3. Step 3: Cross multiply
    316.62x = 437.18 × 218.61
  4. Step 4: Simplify right side
    316.62x = 95,570.83
  5. Step 5: Solve for x
    x = 95,570.83/316.62
  6. Step 6: Final answer
    x = 301.85

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.