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Finding the Fourth Proportional to 131.17, 196.78 and 39.86

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Solution

The fourth proportional to 131.17, 196.78 and 39.86 is: 59.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.17 : 196.78 = 39.86 : x
  2. Step 2: Convert to fraction form
    131.17/196.78 = 39.86/x
  3. Step 3: Cross multiply
    131.17x = 196.78 × 39.86
  4. Step 4: Simplify right side
    131.17x = 7,843.75
  5. Step 5: Solve for x
    x = 7,843.75/131.17
  6. Step 6: Final answer
    x = 59.80

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.