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Finding the Fourth Proportional to 196.91, 271.70 and 112.87

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Solution

The fourth proportional to 196.91, 271.70 and 112.87 is: 155.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    196.91 : 271.70 = 112.87 : x
  2. Step 2: Convert to fraction form
    196.91/271.70 = 112.87/x
  3. Step 3: Cross multiply
    196.91x = 271.70 × 112.87
  4. Step 4: Simplify right side
    196.91x = 30,666.78
  5. Step 5: Solve for x
    x = 30,666.78/196.91
  6. Step 6: Final answer
    x = 155.74

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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.