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Finding the Fourth Proportional to 216.57, 324.79 and 77.72

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Solution

The fourth proportional to 216.57, 324.79 and 77.72 is: 116.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    216.57 : 324.79 = 77.72 : x
  2. Step 2: Convert to fraction form
    216.57/324.79 = 77.72/x
  3. Step 3: Cross multiply
    216.57x = 324.79 × 77.72
  4. Step 4: Simplify right side
    216.57x = 25,240.86
  5. Step 5: Solve for x
    x = 25,240.86/216.57
  6. Step 6: Final answer
    x = 116.55

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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.