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Finding the Fourth Proportional to 8,147.78, 11,243.88 and 4,421.78

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Solution

The fourth proportional to 8,147.78, 11,243.88 and 4,421.78 is: 6,102.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,147.78 : 11,243.88 = 4,421.78 : x
  2. Step 2: Convert to fraction form
    8,147.78/11,243.88 = 4,421.78/x
  3. Step 3: Cross multiply
    8,147.78x = 11,243.88 × 4,421.78
  4. Step 4: Simplify right side
    8,147.78x = 49,717,963.71
  5. Step 5: Solve for x
    x = 49,717,963.71/8,147.78
  6. Step 6: Final answer
    x = 6,102.03

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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.