Home / 7,142.60-9,856.76-3,998.78

Finding the Fourth Proportional to 7,142.60, 9,856.76 and 3,998.78

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Solution

The fourth proportional to 7,142.60, 9,856.76 and 3,998.78 is: 5,518.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,142.60 : 9,856.76 = 3,998.78 : x
  2. Step 2: Convert to fraction form
    7,142.60/9,856.76 = 3,998.78/x
  3. Step 3: Cross multiply
    7,142.60x = 9,856.76 × 3,998.78
  4. Step 4: Simplify right side
    7,142.60x = 39,415,049.39
  5. Step 5: Solve for x
    x = 39,415,049.39/7,142.60
  6. Step 6: Final answer
    x = 5,518.31

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Half scale
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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 (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.