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Finding the Fourth Proportional to 423.72, 635.45 and 163.70

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Solution

The fourth proportional to 423.72, 635.45 and 163.70 is: 245.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    423.72 : 635.45 = 163.70 : x
  2. Step 2: Convert to fraction form
    423.72/635.45 = 163.70/x
  3. Step 3: Cross multiply
    423.72x = 635.45 × 163.70
  4. Step 4: Simplify right side
    423.72x = 104,023.17
  5. Step 5: Solve for x
    x = 104,023.17/423.72
  6. Step 6: Final answer
    x = 245.50

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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.