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Finding the Fourth Proportional to 8,131.69, 11,221.73 and 4,405.69

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Solution

The fourth proportional to 8,131.69, 11,221.73 and 4,405.69 is: 6,079.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,131.69 : 11,221.73 = 4,405.69 : x
  2. Step 2: Convert to fraction form
    8,131.69/11,221.73 = 4,405.69/x
  3. Step 3: Cross multiply
    8,131.69x = 11,221.73 × 4,405.69
  4. Step 4: Simplify right side
    8,131.69x = 49,439,463.64
  5. Step 5: Solve for x
    x = 49,439,463.64/8,131.69
  6. Step 6: Final answer
    x = 6,079.85

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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.