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Finding the Fourth Proportional to 1,331.07, 1,996.62 and 638.43

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Solution

The fourth proportional to 1,331.07, 1,996.62 and 638.43 is: 957.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,331.07 : 1,996.62 = 638.43 : x
  2. Step 2: Convert to fraction form
    1,331.07/1,996.62 = 638.43/x
  3. Step 3: Cross multiply
    1,331.07x = 1,996.62 × 638.43
  4. Step 4: Simplify right side
    1,331.07x = 1,274,702.11
  5. Step 5: Solve for x
    x = 1,274,702.11/1,331.07
  6. Step 6: Final answer
    x = 957.65

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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.