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Finding the Fourth Proportional to 218.50, 327.53 and 81.50

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Solution

The fourth proportional to 218.50, 327.53 and 81.50 is: 122.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.50 : 327.53 = 81.50 : x
  2. Step 2: Convert to fraction form
    218.50/327.53 = 81.50/x
  3. Step 3: Cross multiply
    218.50x = 327.53 × 81.50
  4. Step 4: Simplify right side
    218.50x = 26,692.26
  5. Step 5: Solve for x
    x = 26,692.26/218.50
  6. Step 6: Final answer
    x = 122.16

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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.