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Finding the Fourth Proportional to 218.79, 326.25 and 203.90

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Solution

The fourth proportional to 218.79, 326.25 and 203.90 is: 304.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.79 : 326.25 = 203.90 : x
  2. Step 2: Convert to fraction form
    218.79/326.25 = 203.90/x
  3. Step 3: Cross multiply
    218.79x = 326.25 × 203.90
  4. Step 4: Simplify right side
    218.79x = 66,520.74
  5. Step 5: Solve for x
    x = 66,520.74/218.79
  6. Step 6: Final answer
    x = 304.04

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.