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Finding the Fourth Proportional to 179.62, 247.89 and 121.30

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Solution

The fourth proportional to 179.62, 247.89 and 121.30 is: 167.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    179.62 : 247.89 = 121.30 : x
  2. Step 2: Convert to fraction form
    179.62/247.89 = 121.30/x
  3. Step 3: Cross multiply
    179.62x = 247.89 × 121.30
  4. Step 4: Simplify right side
    179.62x = 30,069.06
  5. Step 5: Solve for x
    x = 30,069.06/179.62
  6. Step 6: Final answer
    x = 167.40

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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.