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Finding the Fourth Proportional to 196.72, 271.58 and 126.88

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Solution

The fourth proportional to 196.72, 271.58 and 126.88 is: 175.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    196.72 : 271.58 = 126.88 : x
  2. Step 2: Convert to fraction form
    196.72/271.58 = 126.88/x
  3. Step 3: Cross multiply
    196.72x = 271.58 × 126.88
  4. Step 4: Simplify right side
    196.72x = 34,457.47
  5. Step 5: Solve for x
    x = 34,457.47/196.72
  6. Step 6: Final answer
    x = 175.16

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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.