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Finding the Fourth Proportional to 196.99, 271.85 and 109.65

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Solution

The fourth proportional to 196.99, 271.85 and 109.65 is: 151.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    196.99 : 271.85 = 109.65 : x
  2. Step 2: Convert to fraction form
    196.99/271.85 = 109.65/x
  3. Step 3: Cross multiply
    196.99x = 271.85 × 109.65
  4. Step 4: Simplify right side
    196.99x = 29,808.82
  5. Step 5: Solve for x
    x = 29,808.82/196.99
  6. Step 6: Final answer
    x = 151.32

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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.