Home / 220.23-330.21-90.18

Finding the Fourth Proportional to 220.23, 330.21 and 90.18

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Solution

The fourth proportional to 220.23, 330.21 and 90.18 is: 135.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    220.23 : 330.21 = 90.18 : x
  2. Step 2: Convert to fraction form
    220.23/330.21 = 90.18/x
  3. Step 3: Cross multiply
    220.23x = 330.21 × 90.18
  4. Step 4: Simplify right side
    220.23x = 29,778.34
  5. Step 5: Solve for x
    x = 29,778.34/220.23
  6. Step 6: Final answer
    x = 135.21

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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.