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Finding the Fourth Proportional to 426.54, 639.81 and 118.39

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Solution

The fourth proportional to 426.54, 639.81 and 118.39 is: 177.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    426.54 : 639.81 = 118.39 : x
  2. Step 2: Convert to fraction form
    426.54/639.81 = 118.39/x
  3. Step 3: Cross multiply
    426.54x = 639.81 × 118.39
  4. Step 4: Simplify right side
    426.54x = 75,747.11
  5. Step 5: Solve for x
    x = 75,747.11/426.54
  6. Step 6: Final answer
    x = 177.59

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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.