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Finding the Fourth Proportional to 151.80, 227.78 and 91.05

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Solution

The fourth proportional to 151.80, 227.78 and 91.05 is: 136.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    151.80 : 227.78 = 91.05 : x
  2. Step 2: Convert to fraction form
    151.80/227.78 = 91.05/x
  3. Step 3: Cross multiply
    151.80x = 227.78 × 91.05
  4. Step 4: Simplify right side
    151.80x = 20,739.37
  5. Step 5: Solve for x
    x = 20,739.37/151.80
  6. Step 6: Final answer
    x = 136.62

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.