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Finding the Fourth Proportional to 660.68, 991.15 and 227.78

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Solution

The fourth proportional to 660.68, 991.15 and 227.78 is: 341.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.68 : 991.15 = 227.78 : x
  2. Step 2: Convert to fraction form
    660.68/991.15 = 227.78/x
  3. Step 3: Cross multiply
    660.68x = 991.15 × 227.78
  4. Step 4: Simplify right side
    660.68x = 225,758.05
  5. Step 5: Solve for x
    x = 225,758.05/660.68
  6. Step 6: Final answer
    x = 341.71

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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.