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Finding the Fourth Proportional to 218.35, 301.28 and 129.79

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Solution

The fourth proportional to 218.35, 301.28 and 129.79 is: 179.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.35 : 301.28 = 129.79 : x
  2. Step 2: Convert to fraction form
    218.35/301.28 = 129.79/x
  3. Step 3: Cross multiply
    218.35x = 301.28 × 129.79
  4. Step 4: Simplify right side
    218.35x = 39,103.13
  5. Step 5: Solve for x
    x = 39,103.13/218.35
  6. Step 6: Final answer
    x = 179.08

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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.