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Finding the Fourth Proportional to 15,104.80, 20,843.90 and 8,390.86

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Solution

The fourth proportional to 15,104.80, 20,843.90 and 8,390.86 is: 11,578.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,104.80 : 20,843.90 = 8,390.86 : x
  2. Step 2: Convert to fraction form
    15,104.80/20,843.90 = 8,390.86/x
  3. Step 3: Cross multiply
    15,104.80x = 20,843.90 × 8,390.86
  4. Step 4: Simplify right side
    15,104.80x = 174,898,246.75
  5. Step 5: Solve for x
    x = 174,898,246.75/15,104.80
  6. Step 6: Final answer
    x = 11,578.98

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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.