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Finding the Fourth Proportional to 218.72, 326.68 and 170.72

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Solution

The fourth proportional to 218.72, 326.68 and 170.72 is: 254.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.72 : 326.68 = 170.72 : x
  2. Step 2: Convert to fraction form
    218.72/326.68 = 170.72/x
  3. Step 3: Cross multiply
    218.72x = 326.68 × 170.72
  4. Step 4: Simplify right side
    218.72x = 55,770.81
  5. Step 5: Solve for x
    x = 55,770.81/218.72
  6. Step 6: Final answer
    x = 254.99

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.