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Finding the Fourth Proportional to 216.50, 324.76 and 72.20

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Solution

The fourth proportional to 216.50, 324.76 and 72.20 is: 108.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    216.50 : 324.76 = 72.20 : x
  2. Step 2: Convert to fraction form
    216.50/324.76 = 72.20/x
  3. Step 3: Cross multiply
    216.50x = 324.76 × 72.20
  4. Step 4: Simplify right side
    216.50x = 23,447.67
  5. Step 5: Solve for x
    x = 23,447.67/216.50
  6. Step 6: Final answer
    x = 108.30

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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.