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Finding the Fourth Proportional to 223.36, 335.17 and 86.42

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Solution

The fourth proportional to 223.36, 335.17 and 86.42 is: 129.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    223.36 : 335.17 = 86.42 : x
  2. Step 2: Convert to fraction form
    223.36/335.17 = 86.42/x
  3. Step 3: Cross multiply
    223.36x = 335.17 × 86.42
  4. Step 4: Simplify right side
    223.36x = 28,965.39
  5. Step 5: Solve for x
    x = 28,965.39/223.36
  6. Step 6: Final answer
    x = 129.68

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.