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Finding the Fourth Proportional to 217.04, 299.43 and 129.69

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Solution

The fourth proportional to 217.04, 299.43 and 129.69 is: 178.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.04 : 299.43 = 129.69 : x
  2. Step 2: Convert to fraction form
    217.04/299.43 = 129.69/x
  3. Step 3: Cross multiply
    217.04x = 299.43 × 129.69
  4. Step 4: Simplify right side
    217.04x = 38,833.08
  5. Step 5: Solve for x
    x = 38,833.08/217.04
  6. Step 6: Final answer
    x = 178.93

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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.