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Finding the Fourth Proportional to 423.62, 634.92 and 218.28

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Solution

The fourth proportional to 423.62, 634.92 and 218.28 is: 327.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    423.62 : 634.92 = 218.28 : x
  2. Step 2: Convert to fraction form
    423.62/634.92 = 218.28/x
  3. Step 3: Cross multiply
    423.62x = 634.92 × 218.28
  4. Step 4: Simplify right side
    423.62x = 138,590.34
  5. Step 5: Solve for x
    x = 138,590.34/423.62
  6. Step 6: Final answer
    x = 327.16

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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.