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Finding the Fourth Proportional to 216.80, 324.78 and 193.72

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Solution

The fourth proportional to 216.80, 324.78 and 193.72 is: 290.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    216.80 : 324.78 = 193.72 : x
  2. Step 2: Convert to fraction form
    216.80/324.78 = 193.72/x
  3. Step 3: Cross multiply
    216.80x = 324.78 × 193.72
  4. Step 4: Simplify right side
    216.80x = 62,916.38
  5. Step 5: Solve for x
    x = 62,916.38/216.80
  6. Step 6: Final answer
    x = 290.20

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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.