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Finding the Fourth Proportional to 191.82, 287.91 and 137.82

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Solution

The fourth proportional to 191.82, 287.91 and 137.82 is: 206.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    191.82 : 287.91 = 137.82 : x
  2. Step 2: Convert to fraction form
    191.82/287.91 = 137.82/x
  3. Step 3: Cross multiply
    191.82x = 287.91 × 137.82
  4. Step 4: Simplify right side
    191.82x = 39,679.76
  5. Step 5: Solve for x
    x = 39,679.76/191.82
  6. Step 6: Final answer
    x = 206.86

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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.