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Finding the Fourth Proportional to 15,104.60, 20,843.78 and 8,390.66

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Solution

The fourth proportional to 15,104.60, 20,843.78 and 8,390.66 is: 11,578.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,104.60 : 20,843.78 = 8,390.66 : x
  2. Step 2: Convert to fraction form
    15,104.60/20,843.78 = 8,390.66/x
  3. Step 3: Cross multiply
    15,104.60x = 20,843.78 × 8,390.66
  4. Step 4: Simplify right side
    15,104.60x = 174,893,071.09
  5. Step 5: Solve for x
    x = 174,893,071.09/15,104.60
  6. Step 6: Final answer
    x = 11,578.80

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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.