Home / 3,986.39-5,979.58-1,387.50

Finding the Fourth Proportional to 3,986.39, 5,979.58 and 1,387.50

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Solution

The fourth proportional to 3,986.39, 5,979.58 and 1,387.50 is: 2,081.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,986.39 : 5,979.58 = 1,387.50 : x
  2. Step 2: Convert to fraction form
    3,986.39/5,979.58 = 1,387.50/x
  3. Step 3: Cross multiply
    3,986.39x = 5,979.58 × 1,387.50
  4. Step 4: Simplify right side
    3,986.39x = 8,296,667.25
  5. Step 5: Solve for x
    x = 8,296,667.25/3,986.39
  6. Step 6: Final answer
    x = 2,081.25

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Double scale
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Similar ratio
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1.5x scale

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.