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Finding the Fourth Proportional to 216.60, 323.76 and 168

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Solution

The fourth proportional to 216.60, 323.76 and 168 is: 251.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    216.60 : 323.76 = 168 : x
  2. Step 2: Convert to fraction form
    216.60/323.76 = 168/x
  3. Step 3: Cross multiply
    216.60x = 323.76 × 168
  4. Step 4: Simplify right side
    216.60x = 54,391.68
  5. Step 5: Solve for x
    x = 54,391.68/216.60
  6. Step 6: Final answer
    x = 251.12

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.