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Finding the Fourth Proportional to 296.45, 408.31 and 217.56

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Solution

The fourth proportional to 296.45, 408.31 and 217.56 is: 299.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    296.45 : 408.31 = 217.56 : x
  2. Step 2: Convert to fraction form
    296.45/408.31 = 217.56/x
  3. Step 3: Cross multiply
    296.45x = 408.31 × 217.56
  4. Step 4: Simplify right side
    296.45x = 88,831.92
  5. Step 5: Solve for x
    x = 88,831.92/296.45
  6. Step 6: Final answer
    x = 299.65

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.