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Finding the Fourth Proportional to 423.92, 635.81 and 115.72

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Solution

The fourth proportional to 423.92, 635.81 and 115.72 is: 173.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    423.92 : 635.81 = 115.72 : x
  2. Step 2: Convert to fraction form
    423.92/635.81 = 115.72/x
  3. Step 3: Cross multiply
    423.92x = 635.81 × 115.72
  4. Step 4: Simplify right side
    423.92x = 73,574.63
  5. Step 5: Solve for x
    x = 73,574.63/423.92
  6. Step 6: Final answer
    x = 173.56

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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.