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Finding the Fourth Proportional to 423.78, 634.70 and 218.52

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Solution

The fourth proportional to 423.78, 634.70 and 218.52 is: 327.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    423.78 : 634.70 = 218.52 : x
  2. Step 2: Convert to fraction form
    423.78/634.70 = 218.52/x
  3. Step 3: Cross multiply
    423.78x = 634.70 × 218.52
  4. Step 4: Simplify right side
    423.78x = 138,694.64
  5. Step 5: Solve for x
    x = 138,694.64/423.78
  6. Step 6: Final answer
    x = 327.28

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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.