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Finding the Fourth Proportional to 381.86, 572.80 and 121.87

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Solution

The fourth proportional to 381.86, 572.80 and 121.87 is: 182.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    381.86 : 572.80 = 121.87 : x
  2. Step 2: Convert to fraction form
    381.86/572.80 = 121.87/x
  3. Step 3: Cross multiply
    381.86x = 572.80 × 121.87
  4. Step 4: Simplify right side
    381.86x = 69,807.14
  5. Step 5: Solve for x
    x = 69,807.14/381.86
  6. Step 6: Final answer
    x = 182.81

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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.