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Finding the Fourth Proportional to 221.72, 332.66 and 77.56

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Solution

The fourth proportional to 221.72, 332.66 and 77.56 is: 116.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.72 : 332.66 = 77.56 : x
  2. Step 2: Convert to fraction form
    221.72/332.66 = 77.56/x
  3. Step 3: Cross multiply
    221.72x = 332.66 × 77.56
  4. Step 4: Simplify right side
    221.72x = 25,801.11
  5. Step 5: Solve for x
    x = 25,801.11/221.72
  6. Step 6: Final answer
    x = 116.37

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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.