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Finding the Fourth Proportional to 218.36, 327.32 and 90.20

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Solution

The fourth proportional to 218.36, 327.32 and 90.20 is: 135.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.36 : 327.32 = 90.20 : x
  2. Step 2: Convert to fraction form
    218.36/327.32 = 90.20/x
  3. Step 3: Cross multiply
    218.36x = 327.32 × 90.20
  4. Step 4: Simplify right side
    218.36x = 29,524.26
  5. Step 5: Solve for x
    x = 29,524.26/218.36
  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.