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Finding the Fourth Proportional to 15,104.85, 20,843.81 and 8,390.09

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Solution

The fourth proportional to 15,104.85, 20,843.81 and 8,390.09 is: 11,577.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,104.85 : 20,843.81 = 8,390.09 : x
  2. Step 2: Convert to fraction form
    15,104.85/20,843.81 = 8,390.09/x
  3. Step 3: Cross multiply
    15,104.85x = 20,843.81 × 8,390.09
  4. Step 4: Simplify right side
    15,104.85x = 174,881,295.67
  5. Step 5: Solve for x
    x = 174,881,295.67/15,104.85
  6. Step 6: Final answer
    x = 11,577.82

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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.