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Finding the Fourth Proportional to 245.49, 338.07 and 196.21

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Solution

The fourth proportional to 245.49, 338.07 and 196.21 is: 270.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    245.49 : 338.07 = 196.21 : x
  2. Step 2: Convert to fraction form
    245.49/338.07 = 196.21/x
  3. Step 3: Cross multiply
    245.49x = 338.07 × 196.21
  4. Step 4: Simplify right side
    245.49x = 66,332.71
  5. Step 5: Solve for x
    x = 66,332.71/245.49
  6. Step 6: Final answer
    x = 270.21

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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.