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Finding the Fourth Proportional to 216.12, 323.99 and 79.13

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Solution

The fourth proportional to 216.12, 323.99 and 79.13 is: 118.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    216.12 : 323.99 = 79.13 : x
  2. Step 2: Convert to fraction form
    216.12/323.99 = 79.13/x
  3. Step 3: Cross multiply
    216.12x = 323.99 × 79.13
  4. Step 4: Simplify right side
    216.12x = 25,637.33
  5. Step 5: Solve for x
    x = 25,637.33/216.12
  6. Step 6: Final answer
    x = 118.63

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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.