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Finding the Fourth Proportional to 381.28, 571.86 and 124.72

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Solution

The fourth proportional to 381.28, 571.86 and 124.72 is: 187.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    381.28 : 571.86 = 124.72 : x
  2. Step 2: Convert to fraction form
    381.28/571.86 = 124.72/x
  3. Step 3: Cross multiply
    381.28x = 571.86 × 124.72
  4. Step 4: Simplify right side
    381.28x = 71,322.38
  5. Step 5: Solve for x
    x = 71,322.38/381.28
  6. Step 6: Final answer
    x = 187.06

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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.