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Finding the Fourth Proportional to 131.22, 195.15 and 129.81

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Solution

The fourth proportional to 131.22, 195.15 and 129.81 is: 193.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.22 : 195.15 = 129.81 : x
  2. Step 2: Convert to fraction form
    131.22/195.15 = 129.81/x
  3. Step 3: Cross multiply
    131.22x = 195.15 × 129.81
  4. Step 4: Simplify right side
    131.22x = 25,332.42
  5. Step 5: Solve for x
    x = 25,332.42/131.22
  6. Step 6: Final answer
    x = 193.05

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.