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Finding the Fourth Proportional to 180.30, 248.81 and 100.54

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Solution

The fourth proportional to 180.30, 248.81 and 100.54 is: 138.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    180.30 : 248.81 = 100.54 : x
  2. Step 2: Convert to fraction form
    180.30/248.81 = 100.54/x
  3. Step 3: Cross multiply
    180.30x = 248.81 × 100.54
  4. Step 4: Simplify right side
    180.30x = 25,016.15
  5. Step 5: Solve for x
    x = 25,016.15/180.30
  6. Step 6: Final answer
    x = 138.75

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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.