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Finding the Fourth Proportional to 276.38, 414.78 and 139.40

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Solution

The fourth proportional to 276.38, 414.78 and 139.40 is: 209.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    276.38 : 414.78 = 139.40 : x
  2. Step 2: Convert to fraction form
    276.38/414.78 = 139.40/x
  3. Step 3: Cross multiply
    276.38x = 414.78 × 139.40
  4. Step 4: Simplify right side
    276.38x = 57,820.33
  5. Step 5: Solve for x
    x = 57,820.33/276.38
  6. Step 6: Final answer
    x = 209.21

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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.