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Finding the Fourth Proportional to 225.90, 311.85 and 216.72

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Solution

The fourth proportional to 225.90, 311.85 and 216.72 is: 299.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    225.90 : 311.85 = 216.72 : x
  2. Step 2: Convert to fraction form
    225.90/311.85 = 216.72/x
  3. Step 3: Cross multiply
    225.90x = 311.85 × 216.72
  4. Step 4: Simplify right side
    225.90x = 67,584.13
  5. Step 5: Solve for x
    x = 67,584.13/225.90
  6. Step 6: Final answer
    x = 299.18

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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.