Home / 13,221.38-18,245.57-7,171.62

Finding the Fourth Proportional to 13,221.38, 18,245.57 and 7,171.62

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Solution

The fourth proportional to 13,221.38, 18,245.57 and 7,171.62 is: 9,896.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,221.38 : 18,245.57 = 7,171.62 : x
  2. Step 2: Convert to fraction form
    13,221.38/18,245.57 = 7,171.62/x
  3. Step 3: Cross multiply
    13,221.38x = 18,245.57 × 7,171.62
  4. Step 4: Simplify right side
    13,221.38x = 130,850,258.87
  5. Step 5: Solve for x
    x = 130,850,258.87/13,221.38
  6. Step 6: Final answer
    x = 9,896.87

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Half scale
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Double scale
Find fourth proportional to 13,222.38, 18,246.95 and 7,172.62
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.