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Finding the Fourth Proportional to 639.09, 888.06 and 632.41

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Solution

The fourth proportional to 639.09, 888.06 and 632.41 is: 878.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.09 : 888.06 = 632.41 : x
  2. Step 2: Convert to fraction form
    639.09/888.06 = 632.41/x
  3. Step 3: Cross multiply
    639.09x = 888.06 × 632.41
  4. Step 4: Simplify right side
    639.09x = 561,618.18
  5. Step 5: Solve for x
    x = 561,618.18/639.09
  6. Step 6: Final answer
    x = 878.78

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.