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Finding the Fourth Proportional to 3,983.96, 5,978.64 and 1,386.92

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Solution

The fourth proportional to 3,983.96, 5,978.64 and 1,386.92 is: 2,081.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,983.96 : 5,978.64 = 1,386.92 : x
  2. Step 2: Convert to fraction form
    3,983.96/5,978.64 = 1,386.92/x
  3. Step 3: Cross multiply
    3,983.96x = 5,978.64 × 1,386.92
  4. Step 4: Simplify right side
    3,983.96x = 8,291,895.39
  5. Step 5: Solve for x
    x = 8,291,895.39/3,983.96
  6. Step 6: Final answer
    x = 2,081.32

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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.