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Finding the Fourth Proportional to 196.60, 271.28 and 117.90

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Solution

The fourth proportional to 196.60, 271.28 and 117.90 is: 162.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    196.60 : 271.28 = 117.90 : x
  2. Step 2: Convert to fraction form
    196.60/271.28 = 117.90/x
  3. Step 3: Cross multiply
    196.60x = 271.28 × 117.90
  4. Step 4: Simplify right side
    196.60x = 31,981.97
  5. Step 5: Solve for x
    x = 31,981.97/196.60
  6. Step 6: Final answer
    x = 162.68

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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.