Home / 7,142.69-9,856.37-3,998.45

Finding the Fourth Proportional to 7,142.69, 9,856.37 and 3,998.45

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Solution

The fourth proportional to 7,142.69, 9,856.37 and 3,998.45 is: 5,517.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,142.69 : 9,856.37 = 3,998.45 : x
  2. Step 2: Convert to fraction form
    7,142.69/9,856.37 = 3,998.45/x
  3. Step 3: Cross multiply
    7,142.69x = 9,856.37 × 3,998.45
  4. Step 4: Simplify right side
    7,142.69x = 39,410,182.63
  5. Step 5: Solve for x
    x = 39,410,182.63/7,142.69
  6. Step 6: Final answer
    x = 5,517.55

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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.