Home / 3,988.45-5,982.68-1,390.78

Finding the Fourth Proportional to 3,988.45, 5,982.68 and 1,390.78

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Solution

The fourth proportional to 3,988.45, 5,982.68 and 1,390.78 is: 2,086.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,988.45 : 5,982.68 = 1,390.78 : x
  2. Step 2: Convert to fraction form
    3,988.45/5,982.68 = 1,390.78/x
  3. Step 3: Cross multiply
    3,988.45x = 5,982.68 × 1,390.78
  4. Step 4: Simplify right side
    3,988.45x = 8,320,591.69
  5. Step 5: Solve for x
    x = 8,320,591.69/3,988.45
  6. Step 6: Final answer
    x = 2,086.17

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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.