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Finding the Fourth Proportional to 196.43, 294.69 and 138.76

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Solution

The fourth proportional to 196.43, 294.69 and 138.76 is: 208.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    196.43 : 294.69 = 138.76 : x
  2. Step 2: Convert to fraction form
    196.43/294.69 = 138.76/x
  3. Step 3: Cross multiply
    196.43x = 294.69 × 138.76
  4. Step 4: Simplify right side
    196.43x = 40,891.24
  5. Step 5: Solve for x
    x = 40,891.24/196.43
  6. Step 6: Final answer
    x = 208.18

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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.