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Finding the Fourth Proportional to 131.26, 196.78 and 66.28

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Solution

The fourth proportional to 131.26, 196.78 and 66.28 is: 99.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.26 : 196.78 = 66.28 : x
  2. Step 2: Convert to fraction form
    131.26/196.78 = 66.28/x
  3. Step 3: Cross multiply
    131.26x = 196.78 × 66.28
  4. Step 4: Simplify right side
    131.26x = 13,042.58
  5. Step 5: Solve for x
    x = 13,042.58/131.26
  6. Step 6: Final answer
    x = 99.36

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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.