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Finding the Fourth Proportional to 220.67, 331.13 and 90.64

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Solution

The fourth proportional to 220.67, 331.13 and 90.64 is: 136.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    220.67 : 331.13 = 90.64 : x
  2. Step 2: Convert to fraction form
    220.67/331.13 = 90.64/x
  3. Step 3: Cross multiply
    220.67x = 331.13 × 90.64
  4. Step 4: Simplify right side
    220.67x = 30,013.62
  5. Step 5: Solve for x
    x = 30,013.62/220.67
  6. Step 6: Final answer
    x = 136.01

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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.