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Finding the Fourth Proportional to 423.90, 635.55 and 163.80

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Solution

The fourth proportional to 423.90, 635.55 and 163.80 is: 245.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    423.90 : 635.55 = 163.80 : x
  2. Step 2: Convert to fraction form
    423.90/635.55 = 163.80/x
  3. Step 3: Cross multiply
    423.90x = 635.55 × 163.80
  4. Step 4: Simplify right side
    423.90x = 104,103.09
  5. Step 5: Solve for x
    x = 104,103.09/423.90
  6. Step 6: Final answer
    x = 245.58

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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.