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Finding the Fourth Proportional to 191.20, 286.38 and 122.68

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Solution

The fourth proportional to 191.20, 286.38 and 122.68 is: 183.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    191.20 : 286.38 = 122.68 : x
  2. Step 2: Convert to fraction form
    191.20/286.38 = 122.68/x
  3. Step 3: Cross multiply
    191.20x = 286.38 × 122.68
  4. Step 4: Simplify right side
    191.20x = 35,133.10
  5. Step 5: Solve for x
    x = 35,133.10/191.20
  6. Step 6: Final answer
    x = 183.75

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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.