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Finding the Fourth Proportional to 178.97, 268.20 and 121.10

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Solution

The fourth proportional to 178.97, 268.20 and 121.10 is: 181.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    178.97 : 268.20 = 121.10 : x
  2. Step 2: Convert to fraction form
    178.97/268.20 = 121.10/x
  3. Step 3: Cross multiply
    178.97x = 268.20 × 121.10
  4. Step 4: Simplify right side
    178.97x = 32,477.68
  5. Step 5: Solve for x
    x = 32,477.68/178.97
  6. Step 6: Final answer
    x = 181.48

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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.