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Finding the Fourth Proportional to 225.72, 311.58 and 138.51

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Solution

The fourth proportional to 225.72, 311.58 and 138.51 is: 191.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    225.72 : 311.58 = 138.51 : x
  2. Step 2: Convert to fraction form
    225.72/311.58 = 138.51/x
  3. Step 3: Cross multiply
    225.72x = 311.58 × 138.51
  4. Step 4: Simplify right side
    225.72x = 43,156.95
  5. Step 5: Solve for x
    x = 43,156.95/225.72
  6. Step 6: Final answer
    x = 191.20

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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.