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Finding the Fourth Proportional to 137.50, 205.12 and 133.78

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Solution

The fourth proportional to 137.50, 205.12 and 133.78 is: 199.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    137.50 : 205.12 = 133.78 : x
  2. Step 2: Convert to fraction form
    137.50/205.12 = 133.78/x
  3. Step 3: Cross multiply
    137.50x = 205.12 × 133.78
  4. Step 4: Simplify right side
    137.50x = 27,440.95
  5. Step 5: Solve for x
    x = 27,440.95/137.50
  6. Step 6: Final answer
    x = 199.57

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.