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Finding the Fourth Proportional to 180.33, 248.70 and 138.81

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Solution

The fourth proportional to 180.33, 248.70 and 138.81 is: 191.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    180.33 : 248.70 = 138.81 : x
  2. Step 2: Convert to fraction form
    180.33/248.70 = 138.81/x
  3. Step 3: Cross multiply
    180.33x = 248.70 × 138.81
  4. Step 4: Simplify right side
    180.33x = 34,522.05
  5. Step 5: Solve for x
    x = 34,522.05/180.33
  6. Step 6: Final answer
    x = 191.44

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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.