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Finding the Fourth Proportional to 131.93, 198.17 and 91.43

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Solution

The fourth proportional to 131.93, 198.17 and 91.43 is: 137.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.93 : 198.17 = 91.43 : x
  2. Step 2: Convert to fraction form
    131.93/198.17 = 91.43/x
  3. Step 3: Cross multiply
    131.93x = 198.17 × 91.43
  4. Step 4: Simplify right side
    131.93x = 18,118.23
  5. Step 5: Solve for x
    x = 18,118.23/131.93
  6. Step 6: Final answer
    x = 137.33

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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.