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Finding the Fourth Proportional to 1,979.44, 2,967.92 and 938.80

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Solution

The fourth proportional to 1,979.44, 2,967.92 and 938.80 is: 1,407.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,979.44 : 2,967.92 = 938.80 : x
  2. Step 2: Convert to fraction form
    1,979.44/2,967.92 = 938.80/x
  3. Step 3: Cross multiply
    1,979.44x = 2,967.92 × 938.80
  4. Step 4: Simplify right side
    1,979.44x = 2,786,283.30
  5. Step 5: Solve for x
    x = 2,786,283.30/1,979.44
  6. Step 6: Final answer
    x = 1,407.61

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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.