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Finding the Fourth Proportional to 191.38, 286.88 and 119.20

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Solution

The fourth proportional to 191.38, 286.88 and 119.20 is: 178.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    191.38 : 286.88 = 119.20 : x
  2. Step 2: Convert to fraction form
    191.38/286.88 = 119.20/x
  3. Step 3: Cross multiply
    191.38x = 286.88 × 119.20
  4. Step 4: Simplify right side
    191.38x = 34,196.10
  5. Step 5: Solve for x
    x = 34,196.10/191.38
  6. Step 6: Final answer
    x = 178.68

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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.