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Finding the Fourth Proportional to 426.43, 639.61 and 118.29

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Solution

The fourth proportional to 426.43, 639.61 and 118.29 is: 177.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    426.43 : 639.61 = 118.29 : x
  2. Step 2: Convert to fraction form
    426.43/639.61 = 118.29/x
  3. Step 3: Cross multiply
    426.43x = 639.61 × 118.29
  4. Step 4: Simplify right side
    426.43x = 75,658.88
  5. Step 5: Solve for x
    x = 75,658.88/426.43
  6. Step 6: Final answer
    x = 177.43

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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.