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Finding the Fourth Proportional to 8,147.28, 11,243.19 and 4,421.28

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Solution

The fourth proportional to 8,147.28, 11,243.19 and 4,421.28 is: 6,101.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,147.28 : 11,243.19 = 4,421.28 : x
  2. Step 2: Convert to fraction form
    8,147.28/11,243.19 = 4,421.28/x
  3. Step 3: Cross multiply
    8,147.28x = 11,243.19 × 4,421.28
  4. Step 4: Simplify right side
    8,147.28x = 49,709,291.08
  5. Step 5: Solve for x
    x = 49,709,291.08/8,147.28
  6. Step 6: Final answer
    x = 6,101.34

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Half scale
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Double scale
Find fourth proportional to 8,148.28, 11,244.57 and 4,422.28
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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.