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Finding the Fourth Proportional to 638.92, 880.56 and 463.96

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Solution

The fourth proportional to 638.92, 880.56 and 463.96 is: 639.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    638.92 : 880.56 = 463.96 : x
  2. Step 2: Convert to fraction form
    638.92/880.56 = 463.96/x
  3. Step 3: Cross multiply
    638.92x = 880.56 × 463.96
  4. Step 4: Simplify right side
    638.92x = 408,544.62
  5. Step 5: Solve for x
    x = 408,544.62/638.92
  6. Step 6: Final answer
    x = 639.43

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Double scale
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1.5x scale

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.