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Finding the Fourth Proportional to 191.41, 264 and 121.45

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Solution

The fourth proportional to 191.41, 264 and 121.45 is: 167.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    191.41 : 264 = 121.45 : x
  2. Step 2: Convert to fraction form
    191.41/264 = 121.45/x
  3. Step 3: Cross multiply
    191.41x = 264 × 121.45
  4. Step 4: Simplify right side
    191.41x = 32,062.80
  5. Step 5: Solve for x
    x = 32,062.80/191.41
  6. Step 6: Final answer
    x = 167.51

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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.