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Finding the Fourth Proportional to 327.78, 491.78 and 165.33

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Solution

The fourth proportional to 327.78, 491.78 and 165.33 is: 248.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    327.78 : 491.78 = 165.33 : x
  2. Step 2: Convert to fraction form
    327.78/491.78 = 165.33/x
  3. Step 3: Cross multiply
    327.78x = 491.78 × 165.33
  4. Step 4: Simplify right side
    327.78x = 81,306.40
  5. Step 5: Solve for x
    x = 81,306.40/327.78
  6. Step 6: Final answer
    x = 248.05

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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.