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Finding the Fourth Proportional to 8,138.94, 11,231.10 and 4,781.88

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Solution

The fourth proportional to 8,138.94, 11,231.10 and 4,781.88 is: 6,598.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,138.94 : 11,231.10 = 4,781.88 : x
  2. Step 2: Convert to fraction form
    8,138.94/11,231.10 = 4,781.88/x
  3. Step 3: Cross multiply
    8,138.94x = 11,231.10 × 4,781.88
  4. Step 4: Simplify right side
    8,138.94x = 53,705,772.47
  5. Step 5: Solve for x
    x = 53,705,772.47/8,138.94
  6. Step 6: Final answer
    x = 6,598.62

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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.