Home / 8,115.04-11,187.60-5,129.38

Finding the Fourth Proportional to 8,115.04, 11,187.60 and 5,129.38

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Solution

The fourth proportional to 8,115.04, 11,187.60 and 5,129.38 is: 7,071.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,115.04 : 11,187.60 = 5,129.38 : x
  2. Step 2: Convert to fraction form
    8,115.04/11,187.60 = 5,129.38/x
  3. Step 3: Cross multiply
    8,115.04x = 11,187.60 × 5,129.38
  4. Step 4: Simplify right side
    8,115.04x = 57,385,451.69
  5. Step 5: Solve for x
    x = 57,385,451.69/8,115.04
  6. Step 6: Final answer
    x = 7,071.49

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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.