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Finding the Fourth Proportional to 3,986.94, 5,979.82 and 1,354.40

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Solution

The fourth proportional to 3,986.94, 5,979.82 and 1,354.40 is: 2,031.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,986.94 : 5,979.82 = 1,354.40 : x
  2. Step 2: Convert to fraction form
    3,986.94/5,979.82 = 1,354.40/x
  3. Step 3: Cross multiply
    3,986.94x = 5,979.82 × 1,354.40
  4. Step 4: Simplify right side
    3,986.94x = 8,099,068.21
  5. Step 5: Solve for x
    x = 8,099,068.21/3,986.94
  6. Step 6: Final answer
    x = 2,031.40

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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.