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Finding the Fourth Proportional to 381.79, 572.75 and 121.81

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Solution

The fourth proportional to 381.79, 572.75 and 121.81 is: 182.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    381.79 : 572.75 = 121.81 : x
  2. Step 2: Convert to fraction form
    381.79/572.75 = 121.81/x
  3. Step 3: Cross multiply
    381.79x = 572.75 × 121.81
  4. Step 4: Simplify right side
    381.79x = 69,766.68
  5. Step 5: Solve for x
    x = 69,766.68/381.79
  6. Step 6: Final answer
    x = 182.74

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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.