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Finding the Fourth Proportional to 196.60, 271.44 and 138.40

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Solution

The fourth proportional to 196.60, 271.44 and 138.40 is: 191.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    196.60 : 271.44 = 138.40 : x
  2. Step 2: Convert to fraction form
    196.60/271.44 = 138.40/x
  3. Step 3: Cross multiply
    196.60x = 271.44 × 138.40
  4. Step 4: Simplify right side
    196.60x = 37,567.30
  5. Step 5: Solve for x
    x = 37,567.30/196.60
  6. Step 6: Final answer
    x = 191.08

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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.