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Finding the Fourth Proportional to 1,439.39, 1,986.84 and 997.88

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Solution

The fourth proportional to 1,439.39, 1,986.84 and 997.88 is: 1,377.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,439.39 : 1,986.84 = 997.88 : x
  2. Step 2: Convert to fraction form
    1,439.39/1,986.84 = 997.88/x
  3. Step 3: Cross multiply
    1,439.39x = 1,986.84 × 997.88
  4. Step 4: Simplify right side
    1,439.39x = 1,982,617.97
  5. Step 5: Solve for x
    x = 1,982,617.97/1,439.39
  6. Step 6: Final answer
    x = 1,377.41

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.