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Finding the Fourth Proportional to 191.12, 263.56 and 121.16

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Solution

The fourth proportional to 191.12, 263.56 and 121.16 is: 167.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    191.12 : 263.56 = 121.16 : x
  2. Step 2: Convert to fraction form
    191.12/263.56 = 121.16/x
  3. Step 3: Cross multiply
    191.12x = 263.56 × 121.16
  4. Step 4: Simplify right side
    191.12x = 31,932.93
  5. Step 5: Solve for x
    x = 31,932.93/191.12
  6. Step 6: Final answer
    x = 167.08

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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.