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Finding the Fourth Proportional to 178.87, 268.31 and 121.75

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Solution

The fourth proportional to 178.87, 268.31 and 121.75 is: 182.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    178.87 : 268.31 = 121.75 : x
  2. Step 2: Convert to fraction form
    178.87/268.31 = 121.75/x
  3. Step 3: Cross multiply
    178.87x = 268.31 × 121.75
  4. Step 4: Simplify right side
    178.87x = 32,666.74
  5. Step 5: Solve for x
    x = 32,666.74/178.87
  6. Step 6: Final answer
    x = 182.63

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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.