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Finding the Fourth Proportional to 435.20, 651.78 and 218.25

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Solution

The fourth proportional to 435.20, 651.78 and 218.25 is: 326.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    435.20 : 651.78 = 218.25 : x
  2. Step 2: Convert to fraction form
    435.20/651.78 = 218.25/x
  3. Step 3: Cross multiply
    435.20x = 651.78 × 218.25
  4. Step 4: Simplify right side
    435.20x = 142,250.99
  5. Step 5: Solve for x
    x = 142,250.99/435.20
  6. Step 6: Final answer
    x = 326.87

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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.