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Finding the Fourth Proportional to 214.70, 321.97 and 77.71

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Solution

The fourth proportional to 214.70, 321.97 and 77.71 is: 116.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    214.70 : 321.97 = 77.71 : x
  2. Step 2: Convert to fraction form
    214.70/321.97 = 77.71/x
  3. Step 3: Cross multiply
    214.70x = 321.97 × 77.71
  4. Step 4: Simplify right side
    214.70x = 25,020.29
  5. Step 5: Solve for x
    x = 25,020.29/214.70
  6. Step 6: Final answer
    x = 116.54

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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.