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Finding the Fourth Proportional to 191.28, 286.70 and 121.74

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Solution

The fourth proportional to 191.28, 286.70 and 121.74 is: 182.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    191.28 : 286.70 = 121.74 : x
  2. Step 2: Convert to fraction form
    191.28/286.70 = 121.74/x
  3. Step 3: Cross multiply
    191.28x = 286.70 × 121.74
  4. Step 4: Simplify right side
    191.28x = 34,902.33
  5. Step 5: Solve for x
    x = 34,902.33/191.28
  6. Step 6: Final answer
    x = 182.47

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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.