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Finding the Fourth Proportional to 205.48, 308.28 and 91.56

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Solution

The fourth proportional to 205.48, 308.28 and 91.56 is: 137.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    205.48 : 308.28 = 91.56 : x
  2. Step 2: Convert to fraction form
    205.48/308.28 = 91.56/x
  3. Step 3: Cross multiply
    205.48x = 308.28 × 91.56
  4. Step 4: Simplify right side
    205.48x = 28,226.12
  5. Step 5: Solve for x
    x = 28,226.12/205.48
  6. Step 6: Final answer
    x = 137.37

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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.