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Finding the Fourth Proportional to 217.77, 300.54 and 129.29

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Solution

The fourth proportional to 217.77, 300.54 and 129.29 is: 178.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.77 : 300.54 = 129.29 : x
  2. Step 2: Convert to fraction form
    217.77/300.54 = 129.29/x
  3. Step 3: Cross multiply
    217.77x = 300.54 × 129.29
  4. Step 4: Simplify right side
    217.77x = 38,855.31
  5. Step 5: Solve for x
    x = 38,855.31/217.77
  6. Step 6: Final answer
    x = 178.42

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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.