Home / 11,115.96-15,338.38-8,428.68

Finding the Fourth Proportional to 11,115.96, 15,338.38 and 8,428.68

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Solution

The fourth proportional to 11,115.96, 15,338.38 and 8,428.68 is: 11,630.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,115.96 : 15,338.38 = 8,428.68 : x
  2. Step 2: Convert to fraction form
    11,115.96/15,338.38 = 8,428.68/x
  3. Step 3: Cross multiply
    11,115.96x = 15,338.38 × 8,428.68
  4. Step 4: Simplify right side
    11,115.96x = 129,282,296.74
  5. Step 5: Solve for x
    x = 129,282,296.74/11,115.96
  6. Step 6: Final answer
    x = 11,630.33

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Half scale
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Double scale
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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.