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Finding the Fourth Proportional to 225.85, 311.67 and 138.57

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Solution

The fourth proportional to 225.85, 311.67 and 138.57 is: 191.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    225.85 : 311.67 = 138.57 : x
  2. Step 2: Convert to fraction form
    225.85/311.67 = 138.57/x
  3. Step 3: Cross multiply
    225.85x = 311.67 × 138.57
  4. Step 4: Simplify right side
    225.85x = 43,188.11
  5. Step 5: Solve for x
    x = 43,188.11/225.85
  6. Step 6: Final answer
    x = 191.23

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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.