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Finding the Fourth Proportional to 212.97, 319.32 and 121.54

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Solution

The fourth proportional to 212.97, 319.32 and 121.54 is: 182.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    212.97 : 319.32 = 121.54 : x
  2. Step 2: Convert to fraction form
    212.97/319.32 = 121.54/x
  3. Step 3: Cross multiply
    212.97x = 319.32 × 121.54
  4. Step 4: Simplify right side
    212.97x = 38,809.55
  5. Step 5: Solve for x
    x = 38,809.55/212.97
  6. Step 6: Final answer
    x = 182.23

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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.