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Finding the Fourth Proportional to 200.40, 276.56 and 122.80

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Solution

The fourth proportional to 200.40, 276.56 and 122.80 is: 169.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    200.40 : 276.56 = 122.80 : x
  2. Step 2: Convert to fraction form
    200.40/276.56 = 122.80/x
  3. Step 3: Cross multiply
    200.40x = 276.56 × 122.80
  4. Step 4: Simplify right side
    200.40x = 33,961.57
  5. Step 5: Solve for x
    x = 33,961.57/200.40
  6. Step 6: Final answer
    x = 169.47

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.