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Finding the Fourth Proportional to 220.99, 331.40 and 91.06

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Solution

The fourth proportional to 220.99, 331.40 and 91.06 is: 136.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    220.99 : 331.40 = 91.06 : x
  2. Step 2: Convert to fraction form
    220.99/331.40 = 91.06/x
  3. Step 3: Cross multiply
    220.99x = 331.40 × 91.06
  4. Step 4: Simplify right side
    220.99x = 30,177.28
  5. Step 5: Solve for x
    x = 30,177.28/220.99
  6. Step 6: Final answer
    x = 136.55

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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.