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Finding the Fourth Proportional to 203.28, 280.56 and 137.74

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Solution

The fourth proportional to 203.28, 280.56 and 137.74 is: 190.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    203.28 : 280.56 = 137.74 : x
  2. Step 2: Convert to fraction form
    203.28/280.56 = 137.74/x
  3. Step 3: Cross multiply
    203.28x = 280.56 × 137.74
  4. Step 4: Simplify right side
    203.28x = 38,644.33
  5. Step 5: Solve for x
    x = 38,644.33/203.28
  6. Step 6: Final answer
    x = 190.10

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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.