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Finding the Fourth Proportional to 329.90, 495.56 and 278.64

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Solution

The fourth proportional to 329.90, 495.56 and 278.64 is: 418.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    329.90 : 495.56 = 278.64 : x
  2. Step 2: Convert to fraction form
    329.90/495.56 = 278.64/x
  3. Step 3: Cross multiply
    329.90x = 495.56 × 278.64
  4. Step 4: Simplify right side
    329.90x = 138,083.54
  5. Step 5: Solve for x
    x = 138,083.54/329.90
  6. Step 6: Final answer
    x = 418.57

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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.