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Finding the Fourth Proportional to 423.78, 635.66 and 115.63

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Solution

The fourth proportional to 423.78, 635.66 and 115.63 is: 173.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    423.78 : 635.66 = 115.63 : x
  2. Step 2: Convert to fraction form
    423.78/635.66 = 115.63/x
  3. Step 3: Cross multiply
    423.78x = 635.66 × 115.63
  4. Step 4: Simplify right side
    423.78x = 73,499.20
  5. Step 5: Solve for x
    x = 73,499.20/423.78
  6. Step 6: Final answer
    x = 173.44

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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.