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Finding the Fourth Proportional to 137.84, 206.96 and 80.17

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Solution

The fourth proportional to 137.84, 206.96 and 80.17 is: 120.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    137.84 : 206.96 = 80.17 : x
  2. Step 2: Convert to fraction form
    137.84/206.96 = 80.17/x
  3. Step 3: Cross multiply
    137.84x = 206.96 × 80.17
  4. Step 4: Simplify right side
    137.84x = 16,591.98
  5. Step 5: Solve for x
    x = 16,591.98/137.84
  6. Step 6: Final answer
    x = 120.37

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.