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Finding the Fourth Proportional to 131.38, 195.93 and 115.21

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Solution

The fourth proportional to 131.38, 195.93 and 115.21 is: 171.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.38 : 195.93 = 115.21 : x
  2. Step 2: Convert to fraction form
    131.38/195.93 = 115.21/x
  3. Step 3: Cross multiply
    131.38x = 195.93 × 115.21
  4. Step 4: Simplify right side
    131.38x = 22,573.10
  5. Step 5: Solve for x
    x = 22,573.10/131.38
  6. Step 6: Final answer
    x = 171.82

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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.