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Finding the Fourth Proportional to 661.87, 992.67 and 229.15

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Solution

The fourth proportional to 661.87, 992.67 and 229.15 is: 343.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.87 : 992.67 = 229.15 : x
  2. Step 2: Convert to fraction form
    661.87/992.67 = 229.15/x
  3. Step 3: Cross multiply
    661.87x = 992.67 × 229.15
  4. Step 4: Simplify right side
    661.87x = 227,470.33
  5. Step 5: Solve for x
    x = 227,470.33/661.87
  6. Step 6: Final answer
    x = 343.68

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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.