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Finding the Fourth Proportional to 191.20, 263.88 and 121.36

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Solution

The fourth proportional to 191.20, 263.88 and 121.36 is: 167.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    191.20 : 263.88 = 121.36 : x
  2. Step 2: Convert to fraction form
    191.20/263.88 = 121.36/x
  3. Step 3: Cross multiply
    191.20x = 263.88 × 121.36
  4. Step 4: Simplify right side
    191.20x = 32,024.48
  5. Step 5: Solve for x
    x = 32,024.48/191.20
  6. Step 6: Final answer
    x = 167.49

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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.