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Finding the Fourth Proportional to 217.58, 300.24 and 129.05

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Solution

The fourth proportional to 217.58, 300.24 and 129.05 is: 178.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.58 : 300.24 = 129.05 : x
  2. Step 2: Convert to fraction form
    217.58/300.24 = 129.05/x
  3. Step 3: Cross multiply
    217.58x = 300.24 × 129.05
  4. Step 4: Simplify right side
    217.58x = 38,745.97
  5. Step 5: Solve for x
    x = 38,745.97/217.58
  6. Step 6: Final answer
    x = 178.08

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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.