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Finding the Fourth Proportional to 216.38, 324.56 and 72.10

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Solution

The fourth proportional to 216.38, 324.56 and 72.10 is: 108.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    216.38 : 324.56 = 72.10 : x
  2. Step 2: Convert to fraction form
    216.38/324.56 = 72.10/x
  3. Step 3: Cross multiply
    216.38x = 324.56 × 72.10
  4. Step 4: Simplify right side
    216.38x = 23,400.78
  5. Step 5: Solve for x
    x = 23,400.78/216.38
  6. Step 6: Final answer
    x = 108.15

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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.