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Finding the Fourth Proportional to 216.15, 324.06 and 129.36

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Solution

The fourth proportional to 216.15, 324.06 and 129.36 is: 193.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    216.15 : 324.06 = 129.36 : x
  2. Step 2: Convert to fraction form
    216.15/324.06 = 129.36/x
  3. Step 3: Cross multiply
    216.15x = 324.06 × 129.36
  4. Step 4: Simplify right side
    216.15x = 41,920.40
  5. Step 5: Solve for x
    x = 41,920.40/216.15
  6. Step 6: Final answer
    x = 193.94

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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.