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Finding the Fourth Proportional to 191.25, 263.81 and 128.34

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Solution

The fourth proportional to 191.25, 263.81 and 128.34 is: 177.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    191.25 : 263.81 = 128.34 : x
  2. Step 2: Convert to fraction form
    191.25/263.81 = 128.34/x
  3. Step 3: Cross multiply
    191.25x = 263.81 × 128.34
  4. Step 4: Simplify right side
    191.25x = 33,856.73
  5. Step 5: Solve for x
    x = 33,856.73/191.25
  6. Step 6: Final answer
    x = 177.03

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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.