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Finding the Fourth Proportional to 426.62, 640.91 and 336.40

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Solution

The fourth proportional to 426.62, 640.91 and 336.40 is: 505.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    426.62 : 640.91 = 336.40 : x
  2. Step 2: Convert to fraction form
    426.62/640.91 = 336.40/x
  3. Step 3: Cross multiply
    426.62x = 640.91 × 336.40
  4. Step 4: Simplify right side
    426.62x = 215,604.97
  5. Step 5: Solve for x
    x = 215,604.97/426.62
  6. Step 6: Final answer
    x = 505.38

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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.