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Finding the Fourth Proportional to 217.25, 299.81 and 129.91

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Solution

The fourth proportional to 217.25, 299.81 and 129.91 is: 179.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.25 : 299.81 = 129.91 : x
  2. Step 2: Convert to fraction form
    217.25/299.81 = 129.91/x
  3. Step 3: Cross multiply
    217.25x = 299.81 × 129.91
  4. Step 4: Simplify right side
    217.25x = 38,948.32
  5. Step 5: Solve for x
    x = 38,948.32/217.25
  6. Step 6: Final answer
    x = 179.28

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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.