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Finding the Fourth Proportional to 216.78, 324.42 and 177.78

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Solution

The fourth proportional to 216.78, 324.42 and 177.78 is: 266.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    216.78 : 324.42 = 177.78 : x
  2. Step 2: Convert to fraction form
    216.78/324.42 = 177.78/x
  3. Step 3: Cross multiply
    216.78x = 324.42 × 177.78
  4. Step 4: Simplify right side
    216.78x = 57,675.39
  5. Step 5: Solve for x
    x = 57,675.39/216.78
  6. Step 6: Final answer
    x = 266.05

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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.