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Finding the Fourth Proportional to 225.18, 337.89 and 138.72

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Solution

The fourth proportional to 225.18, 337.89 and 138.72 is: 208.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    225.18 : 337.89 = 138.72 : x
  2. Step 2: Convert to fraction form
    225.18/337.89 = 138.72/x
  3. Step 3: Cross multiply
    225.18x = 337.89 × 138.72
  4. Step 4: Simplify right side
    225.18x = 46,872.10
  5. Step 5: Solve for x
    x = 46,872.10/225.18
  6. Step 6: Final answer
    x = 208.15

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.