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Finding the Fourth Proportional to 639.43, 883.27 and 474.49

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Solution

The fourth proportional to 639.43, 883.27 and 474.49 is: 655.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.43 : 883.27 = 474.49 : x
  2. Step 2: Convert to fraction form
    639.43/883.27 = 474.49/x
  3. Step 3: Cross multiply
    639.43x = 883.27 × 474.49
  4. Step 4: Simplify right side
    639.43x = 419,104.48
  5. Step 5: Solve for x
    x = 419,104.48/639.43
  6. Step 6: Final answer
    x = 655.44

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.