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Finding the Fourth Proportional to 225.99, 311.90 and 138.65

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Solution

The fourth proportional to 225.99, 311.90 and 138.65 is: 191.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    225.99 : 311.90 = 138.65 : x
  2. Step 2: Convert to fraction form
    225.99/311.90 = 138.65/x
  3. Step 3: Cross multiply
    225.99x = 311.90 × 138.65
  4. Step 4: Simplify right side
    225.99x = 43,242.68
  5. Step 5: Solve for x
    x = 43,242.68/225.99
  6. Step 6: Final answer
    x = 191.35

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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.