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Finding the Fourth Proportional to 217.28, 299.79 and 129.95

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Solution

The fourth proportional to 217.28, 299.79 and 129.95 is: 179.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.28 : 299.79 = 129.95 : x
  2. Step 2: Convert to fraction form
    217.28/299.79 = 129.95/x
  3. Step 3: Cross multiply
    217.28x = 299.79 × 129.95
  4. Step 4: Simplify right side
    217.28x = 38,957.71
  5. Step 5: Solve for x
    x = 38,957.71/217.28
  6. Step 6: Final answer
    x = 179.30

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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.