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Finding the Fourth Proportional to 191.73, 264.54 and 121.80

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Solution

The fourth proportional to 191.73, 264.54 and 121.80 is: 168.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    191.73 : 264.54 = 121.80 : x
  2. Step 2: Convert to fraction form
    191.73/264.54 = 121.80/x
  3. Step 3: Cross multiply
    191.73x = 264.54 × 121.80
  4. Step 4: Simplify right side
    191.73x = 32,220.97
  5. Step 5: Solve for x
    x = 32,220.97/191.73
  6. Step 6: Final answer
    x = 168.05

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.