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Finding the Fourth Proportional to 218.48, 327.78 and 90.32

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Solution

The fourth proportional to 218.48, 327.78 and 90.32 is: 135.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.48 : 327.78 = 90.32 : x
  2. Step 2: Convert to fraction form
    218.48/327.78 = 90.32/x
  3. Step 3: Cross multiply
    218.48x = 327.78 × 90.32
  4. Step 4: Simplify right side
    218.48x = 29,605.09
  5. Step 5: Solve for x
    x = 29,605.09/218.48
  6. Step 6: Final answer
    x = 135.50

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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.