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Finding the Fourth Proportional to 131.70, 197.91 and 126.90

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Solution

The fourth proportional to 131.70, 197.91 and 126.90 is: 190.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.70 : 197.91 = 126.90 : x
  2. Step 2: Convert to fraction form
    131.70/197.91 = 126.90/x
  3. Step 3: Cross multiply
    131.70x = 197.91 × 126.90
  4. Step 4: Simplify right side
    131.70x = 25,114.78
  5. Step 5: Solve for x
    x = 25,114.78/131.70
  6. Step 6: Final answer
    x = 190.70

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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.