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Finding the Fourth Proportional to 15,189.59, 20,961.14 and 8,290.49

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Solution

The fourth proportional to 15,189.59, 20,961.14 and 8,290.49 is: 11,440.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,189.59 : 20,961.14 = 8,290.49 : x
  2. Step 2: Convert to fraction form
    15,189.59/20,961.14 = 8,290.49/x
  3. Step 3: Cross multiply
    15,189.59x = 20,961.14 × 8,290.49
  4. Step 4: Simplify right side
    15,189.59x = 173,778,121.56
  5. Step 5: Solve for x
    x = 173,778,121.56/15,189.59
  6. Step 6: Final answer
    x = 11,440.61

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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.