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Finding the Fourth Proportional to 218.96, 329.40 and 201.20

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Solution

The fourth proportional to 218.96, 329.40 and 201.20 is: 302.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.96 : 329.40 = 201.20 : x
  2. Step 2: Convert to fraction form
    218.96/329.40 = 201.20/x
  3. Step 3: Cross multiply
    218.96x = 329.40 × 201.20
  4. Step 4: Simplify right side
    218.96x = 66,275.28
  5. Step 5: Solve for x
    x = 66,275.28/218.96
  6. Step 6: Final answer
    x = 302.68

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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.