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Finding the Fourth Proportional to 191.07, 263.66 and 121.11

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Solution

The fourth proportional to 191.07, 263.66 and 121.11 is: 167.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    191.07 : 263.66 = 121.11 : x
  2. Step 2: Convert to fraction form
    191.07/263.66 = 121.11/x
  3. Step 3: Cross multiply
    191.07x = 263.66 × 121.11
  4. Step 4: Simplify right side
    191.07x = 31,932.70
  5. Step 5: Solve for x
    x = 31,932.70/191.07
  6. Step 6: Final answer
    x = 167.13

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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.