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Finding the Fourth Proportional to 191.63, 264.38 and 121.65

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Solution

The fourth proportional to 191.63, 264.38 and 121.65 is: 167.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    191.63 : 264.38 = 121.65 : x
  2. Step 2: Convert to fraction form
    191.63/264.38 = 121.65/x
  3. Step 3: Cross multiply
    191.63x = 264.38 × 121.65
  4. Step 4: Simplify right side
    191.63x = 32,161.22
  5. Step 5: Solve for x
    x = 32,161.22/191.63
  6. Step 6: Final answer
    x = 167.83

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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.