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Finding the Fourth Proportional to 131.94, 198.65 and 91.64

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Solution

The fourth proportional to 131.94, 198.65 and 91.64 is: 137.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.94 : 198.65 = 91.64 : x
  2. Step 2: Convert to fraction form
    131.94/198.65 = 91.64/x
  3. Step 3: Cross multiply
    131.94x = 198.65 × 91.64
  4. Step 4: Simplify right side
    131.94x = 18,202.83
  5. Step 5: Solve for x
    x = 18,202.83/131.94
  6. Step 6: Final answer
    x = 137.96

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.