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Finding the Fourth Proportional to 216.56, 324.72 and 79.53

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Solution

The fourth proportional to 216.56, 324.72 and 79.53 is: 119.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    216.56 : 324.72 = 79.53 : x
  2. Step 2: Convert to fraction form
    216.56/324.72 = 79.53/x
  3. Step 3: Cross multiply
    216.56x = 324.72 × 79.53
  4. Step 4: Simplify right side
    216.56x = 25,824.98
  5. Step 5: Solve for x
    x = 25,824.98/216.56
  6. Step 6: Final answer
    x = 119.25

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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.