Home / 8,221.12-11,346.57-7,947.75

Finding the Fourth Proportional to 8,221.12, 11,346.57 and 7,947.75

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Solution

The fourth proportional to 8,221.12, 11,346.57 and 7,947.75 is: 10,969.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,221.12 : 11,346.57 = 7,947.75 : x
  2. Step 2: Convert to fraction form
    8,221.12/11,346.57 = 7,947.75/x
  3. Step 3: Cross multiply
    8,221.12x = 11,346.57 × 7,947.75
  4. Step 4: Simplify right side
    8,221.12x = 90,179,701.72
  5. Step 5: Solve for x
    x = 90,179,701.72/8,221.12
  6. Step 6: Final answer
    x = 10,969.27

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Half scale
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Double scale
Find fourth proportional to 8,222.12, 11,347.95 and 7,948.75
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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.