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Finding the Fourth Proportional to 203.70, 280.62 and 138.12

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Solution

The fourth proportional to 203.70, 280.62 and 138.12 is: 190.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    203.70 : 280.62 = 138.12 : x
  2. Step 2: Convert to fraction form
    203.70/280.62 = 138.12/x
  3. Step 3: Cross multiply
    203.70x = 280.62 × 138.12
  4. Step 4: Simplify right side
    203.70x = 38,759.23
  5. Step 5: Solve for x
    x = 38,759.23/203.70
  6. Step 6: Final answer
    x = 190.28

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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.