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Finding the Fourth Proportional to 131.62, 197.49 and 85.99

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Solution

The fourth proportional to 131.62, 197.49 and 85.99 is: 129.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.62 : 197.49 = 85.99 : x
  2. Step 2: Convert to fraction form
    131.62/197.49 = 85.99/x
  3. Step 3: Cross multiply
    131.62x = 197.49 × 85.99
  4. Step 4: Simplify right side
    131.62x = 16,982.17
  5. Step 5: Solve for x
    x = 16,982.17/131.62
  6. Step 6: Final answer
    x = 129.02

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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.