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Finding the Fourth Proportional to 179.78, 269.72 and 71.54

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Solution

The fourth proportional to 179.78, 269.72 and 71.54 is: 107.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    179.78 : 269.72 = 71.54 : x
  2. Step 2: Convert to fraction form
    179.78/269.72 = 71.54/x
  3. Step 3: Cross multiply
    179.78x = 269.72 × 71.54
  4. Step 4: Simplify right side
    179.78x = 19,294.06
  5. Step 5: Solve for x
    x = 19,294.06/179.78
  6. Step 6: Final answer
    x = 107.32

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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.