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Finding the Fourth Proportional to 218.88, 325.89 and 217.80

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Solution

The fourth proportional to 218.88, 325.89 and 217.80 is: 324.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.88 : 325.89 = 217.80 : x
  2. Step 2: Convert to fraction form
    218.88/325.89 = 217.80/x
  3. Step 3: Cross multiply
    218.88x = 325.89 × 217.80
  4. Step 4: Simplify right side
    218.88x = 70,978.84
  5. Step 5: Solve for x
    x = 70,978.84/218.88
  6. Step 6: Final answer
    x = 324.28

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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.