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Finding the Fourth Proportional to 11,149.78, 15,373.97 and 8,910.12

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Solution

The fourth proportional to 11,149.78, 15,373.97 and 8,910.12 is: 12,285.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,149.78 : 15,373.97 = 8,910.12 : x
  2. Step 2: Convert to fraction form
    11,149.78/15,373.97 = 8,910.12/x
  3. Step 3: Cross multiply
    11,149.78x = 15,373.97 × 8,910.12
  4. Step 4: Simplify right side
    11,149.78x = 136,983,917.58
  5. Step 5: Solve for x
    x = 136,983,917.58/11,149.78
  6. Step 6: Final answer
    x = 12,285.80

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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.