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Finding the Fourth Proportional to 3,984.89, 5,977.33 and 1,386

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Solution

The fourth proportional to 3,984.89, 5,977.33 and 1,386 is: 2,079

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,984.89 : 5,977.33 = 1,386 : x
  2. Step 2: Convert to fraction form
    3,984.89/5,977.33 = 1,386/x
  3. Step 3: Cross multiply
    3,984.89x = 5,977.33 × 1,386
  4. Step 4: Simplify right side
    3,984.89x = 8,284,575.92
  5. Step 5: Solve for x
    x = 8,284,575.92/3,984.89
  6. Step 6: Final answer
    x = 2,079

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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.