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Finding the Fourth Proportional to 423.61, 635.39 and 115.47

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Solution

The fourth proportional to 423.61, 635.39 and 115.47 is: 173.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    423.61 : 635.39 = 115.47 : x
  2. Step 2: Convert to fraction form
    423.61/635.39 = 115.47/x
  3. Step 3: Cross multiply
    423.61x = 635.39 × 115.47
  4. Step 4: Simplify right side
    423.61x = 73,368.34
  5. Step 5: Solve for x
    x = 73,368.34/423.61
  6. Step 6: Final answer
    x = 173.20

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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.