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Finding the Fourth Proportional to 218.50, 327.90 and 90.25

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Solution

The fourth proportional to 218.50, 327.90 and 90.25 is: 135.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.50 : 327.90 = 90.25 : x
  2. Step 2: Convert to fraction form
    218.50/327.90 = 90.25/x
  3. Step 3: Cross multiply
    218.50x = 327.90 × 90.25
  4. Step 4: Simplify right side
    218.50x = 29,592.98
  5. Step 5: Solve for x
    x = 29,592.98/218.50
  6. Step 6: Final answer
    x = 135.44

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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.