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Finding the Fourth Proportional to 137.82, 206.62 and 72.74

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Solution

The fourth proportional to 137.82, 206.62 and 72.74 is: 109.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    137.82 : 206.62 = 72.74 : x
  2. Step 2: Convert to fraction form
    137.82/206.62 = 72.74/x
  3. Step 3: Cross multiply
    137.82x = 206.62 × 72.74
  4. Step 4: Simplify right side
    137.82x = 15,029.54
  5. Step 5: Solve for x
    x = 15,029.54/137.82
  6. Step 6: Final answer
    x = 109.05

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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.