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Finding the Fourth Proportional to 225.74, 311.60 and 138.42

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Solution

The fourth proportional to 225.74, 311.60 and 138.42 is: 191.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    225.74 : 311.60 = 138.42 : x
  2. Step 2: Convert to fraction form
    225.74/311.60 = 138.42/x
  3. Step 3: Cross multiply
    225.74x = 311.60 × 138.42
  4. Step 4: Simplify right side
    225.74x = 43,131.67
  5. Step 5: Solve for x
    x = 43,131.67/225.74
  6. Step 6: Final answer
    x = 191.07

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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.