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Finding the Fourth Proportional to 218.16, 327.36 and 137.16

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Solution

The fourth proportional to 218.16, 327.36 and 137.16 is: 205.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.16 : 327.36 = 137.16 : x
  2. Step 2: Convert to fraction form
    218.16/327.36 = 137.16/x
  3. Step 3: Cross multiply
    218.16x = 327.36 × 137.16
  4. Step 4: Simplify right side
    218.16x = 44,900.70
  5. Step 5: Solve for x
    x = 44,900.70/218.16
  6. Step 6: Final answer
    x = 205.82

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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.