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Finding the Fourth Proportional to 196.80, 295.20 and 68.48

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Solution

The fourth proportional to 196.80, 295.20 and 68.48 is: 102.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    196.80 : 295.20 = 68.48 : x
  2. Step 2: Convert to fraction form
    196.80/295.20 = 68.48/x
  3. Step 3: Cross multiply
    196.80x = 295.20 × 68.48
  4. Step 4: Simplify right side
    196.80x = 20,215.30
  5. Step 5: Solve for x
    x = 20,215.30/196.80
  6. Step 6: Final answer
    x = 102.72

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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.