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Finding the Fourth Proportional to 423.88, 635.90 and 218.40

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Solution

The fourth proportional to 423.88, 635.90 and 218.40 is: 327.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    423.88 : 635.90 = 218.40 : x
  2. Step 2: Convert to fraction form
    423.88/635.90 = 218.40/x
  3. Step 3: Cross multiply
    423.88x = 635.90 × 218.40
  4. Step 4: Simplify right side
    423.88x = 138,878.31
  5. Step 5: Solve for x
    x = 138,878.31/423.88
  6. Step 6: Final answer
    x = 327.63

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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.