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Finding the Fourth Proportional to 426.92, 640.36 and 118.82

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Solution

The fourth proportional to 426.92, 640.36 and 118.82 is: 178.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    426.92 : 640.36 = 118.82 : x
  2. Step 2: Convert to fraction form
    426.92/640.36 = 118.82/x
  3. Step 3: Cross multiply
    426.92x = 640.36 × 118.82
  4. Step 4: Simplify right side
    426.92x = 76,085.05
  5. Step 5: Solve for x
    x = 76,085.05/426.92
  6. Step 6: Final answer
    x = 178.22

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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.