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Finding the Fourth Proportional to 3,979.90, 5,966.19 and 1,381

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Solution

The fourth proportional to 3,979.90, 5,966.19 and 1,381 is: 2,070.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,979.90 : 5,966.19 = 1,381 : x
  2. Step 2: Convert to fraction form
    3,979.90/5,966.19 = 1,381/x
  3. Step 3: Cross multiply
    3,979.90x = 5,966.19 × 1,381
  4. Step 4: Simplify right side
    3,979.90x = 8,239,308.39
  5. Step 5: Solve for x
    x = 8,239,308.39/3,979.90
  6. Step 6: Final answer
    x = 2,070.23

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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.