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Finding the Fourth Proportional to 196.63, 271.42 and 138.31

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Solution

The fourth proportional to 196.63, 271.42 and 138.31 is: 190.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    196.63 : 271.42 = 138.31 : x
  2. Step 2: Convert to fraction form
    196.63/271.42 = 138.31/x
  3. Step 3: Cross multiply
    196.63x = 271.42 × 138.31
  4. Step 4: Simplify right side
    196.63x = 37,539.08
  5. Step 5: Solve for x
    x = 37,539.08/196.63
  6. Step 6: Final answer
    x = 190.91

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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.