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Finding the Fourth Proportional to 131.10, 196.65 and 128.22

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Solution

The fourth proportional to 131.10, 196.65 and 128.22 is: 192.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.10 : 196.65 = 128.22 : x
  2. Step 2: Convert to fraction form
    131.10/196.65 = 128.22/x
  3. Step 3: Cross multiply
    131.10x = 196.65 × 128.22
  4. Step 4: Simplify right side
    131.10x = 25,213.78
  5. Step 5: Solve for x
    x = 25,213.78/131.10
  6. Step 6: Final answer
    x = 192.33

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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.