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Finding the Fourth Proportional to 427.43, 640.55 and 336.31

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Solution

The fourth proportional to 427.43, 640.55 and 336.31 is: 503.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    427.43 : 640.55 = 336.31 : x
  2. Step 2: Convert to fraction form
    427.43/640.55 = 336.31/x
  3. Step 3: Cross multiply
    427.43x = 640.55 × 336.31
  4. Step 4: Simplify right side
    427.43x = 215,418.49
  5. Step 5: Solve for x
    x = 215,418.49/427.43
  6. Step 6: Final answer
    x = 503.99

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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.