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Finding the Fourth Proportional to 191.28, 263.90 and 121.32

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Solution

The fourth proportional to 191.28, 263.90 and 121.32 is: 167.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    191.28 : 263.90 = 121.32 : x
  2. Step 2: Convert to fraction form
    191.28/263.90 = 121.32/x
  3. Step 3: Cross multiply
    191.28x = 263.90 × 121.32
  4. Step 4: Simplify right side
    191.28x = 32,015.74
  5. Step 5: Solve for x
    x = 32,015.74/191.28
  6. Step 6: Final answer
    x = 167.38

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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.