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Finding the Fourth Proportional to 218.25, 300.81 and 203.28

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Solution

The fourth proportional to 218.25, 300.81 and 203.28 is: 280.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.25 : 300.81 = 203.28 : x
  2. Step 2: Convert to fraction form
    218.25/300.81 = 203.28/x
  3. Step 3: Cross multiply
    218.25x = 300.81 × 203.28
  4. Step 4: Simplify right side
    218.25x = 61,148.66
  5. Step 5: Solve for x
    x = 61,148.66/218.25
  6. Step 6: Final answer
    x = 280.18

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.