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Finding the Fourth Proportional to 179.70, 247.86 and 121.38

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Solution

The fourth proportional to 179.70, 247.86 and 121.38 is: 167.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    179.70 : 247.86 = 121.38 : x
  2. Step 2: Convert to fraction form
    179.70/247.86 = 121.38/x
  3. Step 3: Cross multiply
    179.70x = 247.86 × 121.38
  4. Step 4: Simplify right side
    179.70x = 30,085.25
  5. Step 5: Solve for x
    x = 30,085.25/179.70
  6. Step 6: Final answer
    x = 167.42

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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.