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Finding the Fourth Proportional to 276.63, 414.60 and 139.71

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Solution

The fourth proportional to 276.63, 414.60 and 139.71 is: 209.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    276.63 : 414.60 = 139.71 : x
  2. Step 2: Convert to fraction form
    276.63/414.60 = 139.71/x
  3. Step 3: Cross multiply
    276.63x = 414.60 × 139.71
  4. Step 4: Simplify right side
    276.63x = 57,923.77
  5. Step 5: Solve for x
    x = 57,923.77/276.63
  6. Step 6: Final answer
    x = 209.39

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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.