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Finding the Fourth Proportional to 196.72, 294.95 and 81.10

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Solution

The fourth proportional to 196.72, 294.95 and 81.10 is: 121.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    196.72 : 294.95 = 81.10 : x
  2. Step 2: Convert to fraction form
    196.72/294.95 = 81.10/x
  3. Step 3: Cross multiply
    196.72x = 294.95 × 81.10
  4. Step 4: Simplify right side
    196.72x = 23,921.13
  5. Step 5: Solve for x
    x = 23,921.13/196.72
  6. Step 6: Final answer
    x = 121.60

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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.