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Finding the Fourth Proportional to 217.63, 300.35 and 129.12

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Solution

The fourth proportional to 217.63, 300.35 and 129.12 is: 178.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.63 : 300.35 = 129.12 : x
  2. Step 2: Convert to fraction form
    217.63/300.35 = 129.12/x
  3. Step 3: Cross multiply
    217.63x = 300.35 × 129.12
  4. Step 4: Simplify right side
    217.63x = 38,781.19
  5. Step 5: Solve for x
    x = 38,781.19/217.63
  6. Step 6: Final answer
    x = 178.20

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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.