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Finding the Fourth Proportional to 191.93, 287.78 and 131.13

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Solution

The fourth proportional to 191.93, 287.78 and 131.13 is: 196.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    191.93 : 287.78 = 131.13 : x
  2. Step 2: Convert to fraction form
    191.93/287.78 = 131.13/x
  3. Step 3: Cross multiply
    191.93x = 287.78 × 131.13
  4. Step 4: Simplify right side
    191.93x = 37,735.94
  5. Step 5: Solve for x
    x = 37,735.94/191.93
  6. Step 6: Final answer
    x = 196.62

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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.