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Finding the Fourth Proportional to 216.40, 324.60 and 72.12

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Solution

The fourth proportional to 216.40, 324.60 and 72.12 is: 108.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    216.40 : 324.60 = 72.12 : x
  2. Step 2: Convert to fraction form
    216.40/324.60 = 72.12/x
  3. Step 3: Cross multiply
    216.40x = 324.60 × 72.12
  4. Step 4: Simplify right side
    216.40x = 23,408.93
  5. Step 5: Solve for x
    x = 23,408.93/216.40
  6. Step 6: Final answer
    x = 108.18

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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.