Home / 8,128.66-11,222.38-5,147.05

Finding the Fourth Proportional to 8,128.66, 11,222.38 and 5,147.05

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Solution

The fourth proportional to 8,128.66, 11,222.38 and 5,147.05 is: 7,105.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,128.66 : 11,222.38 = 5,147.05 : x
  2. Step 2: Convert to fraction form
    8,128.66/11,222.38 = 5,147.05/x
  3. Step 3: Cross multiply
    8,128.66x = 11,222.38 × 5,147.05
  4. Step 4: Simplify right side
    8,128.66x = 57,762,135.79
  5. Step 5: Solve for x
    x = 57,762,135.79/8,128.66
  6. Step 6: Final answer
    x = 7,105.99

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Half scale
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Double scale
Find fourth proportional to 8,129.66, 11,223.76 and 5,148.05
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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.