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Finding the Fourth Proportional to 118.89, 164.08 and 91.21

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Solution

The fourth proportional to 118.89, 164.08 and 91.21 is: 125.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.89 : 164.08 = 91.21 : x
  2. Step 2: Convert to fraction form
    118.89/164.08 = 91.21/x
  3. Step 3: Cross multiply
    118.89x = 164.08 × 91.21
  4. Step 4: Simplify right side
    118.89x = 14,965.99
  5. Step 5: Solve for x
    x = 14,965.99/118.89
  6. Step 6: Final answer
    x = 125.88

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.