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Finding the Fourth Proportional to 216.75, 325.15 and 72.47

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Solution

The fourth proportional to 216.75, 325.15 and 72.47 is: 108.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    216.75 : 325.15 = 72.47 : x
  2. Step 2: Convert to fraction form
    216.75/325.15 = 72.47/x
  3. Step 3: Cross multiply
    216.75x = 325.15 × 72.47
  4. Step 4: Simplify right side
    216.75x = 23,563.62
  5. Step 5: Solve for x
    x = 23,563.62/216.75
  6. Step 6: Final answer
    x = 108.71

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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.