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Finding the Fourth Proportional to 638.80, 881.16 and 463.84

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Solution

The fourth proportional to 638.80, 881.16 and 463.84 is: 639.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    638.80 : 881.16 = 463.84 : x
  2. Step 2: Convert to fraction form
    638.80/881.16 = 463.84/x
  3. Step 3: Cross multiply
    638.80x = 881.16 × 463.84
  4. Step 4: Simplify right side
    638.80x = 408,717.25
  5. Step 5: Solve for x
    x = 408,717.25/638.80
  6. Step 6: Final answer
    x = 639.82

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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.