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Finding the Fourth Proportional to 200.45, 276.49 and 138.28

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Solution

The fourth proportional to 200.45, 276.49 and 138.28 is: 190.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    200.45 : 276.49 = 138.28 : x
  2. Step 2: Convert to fraction form
    200.45/276.49 = 138.28/x
  3. Step 3: Cross multiply
    200.45x = 276.49 × 138.28
  4. Step 4: Simplify right side
    200.45x = 38,232.35
  5. Step 5: Solve for x
    x = 38,232.35/200.45
  6. Step 6: Final answer
    x = 190.74

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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.