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Finding the Fourth Proportional to 245.45, 338.51 and 196.31

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Solution

The fourth proportional to 245.45, 338.51 and 196.31 is: 270.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    245.45 : 338.51 = 196.31 : x
  2. Step 2: Convert to fraction form
    245.45/338.51 = 196.31/x
  3. Step 3: Cross multiply
    245.45x = 338.51 × 196.31
  4. Step 4: Simplify right side
    245.45x = 66,451.92
  5. Step 5: Solve for x
    x = 66,451.92/245.45
  6. Step 6: Final answer
    x = 270.74

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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.