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Finding the Fourth Proportional to 1,984.28, 2,976.39 and 685.72

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Solution

The fourth proportional to 1,984.28, 2,976.39 and 685.72 is: 1,028.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,984.28 : 2,976.39 = 685.72 : x
  2. Step 2: Convert to fraction form
    1,984.28/2,976.39 = 685.72/x
  3. Step 3: Cross multiply
    1,984.28x = 2,976.39 × 685.72
  4. Step 4: Simplify right side
    1,984.28x = 2,040,962.71
  5. Step 5: Solve for x
    x = 2,040,962.71/1,984.28
  6. Step 6: Final answer
    x = 1,028.56

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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.