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Finding the Fourth Proportional to 200.80, 277 and 123.20

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Solution

The fourth proportional to 200.80, 277 and 123.20 is: 169.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    200.80 : 277 = 123.20 : x
  2. Step 2: Convert to fraction form
    200.80/277 = 123.20/x
  3. Step 3: Cross multiply
    200.80x = 277 × 123.20
  4. Step 4: Simplify right side
    200.80x = 34,126.40
  5. Step 5: Solve for x
    x = 34,126.40/200.80
  6. Step 6: Final answer
    x = 169.95

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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.