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Finding the Fourth Proportional to 137.76, 190.10 and 82.49

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Solution

The fourth proportional to 137.76, 190.10 and 82.49 is: 113.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    137.76 : 190.10 = 82.49 : x
  2. Step 2: Convert to fraction form
    137.76/190.10 = 82.49/x
  3. Step 3: Cross multiply
    137.76x = 190.10 × 82.49
  4. Step 4: Simplify right side
    137.76x = 15,682.13
  5. Step 5: Solve for x
    x = 15,682.13/137.76
  6. Step 6: Final answer
    x = 113.84

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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.