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Finding the Fourth Proportional to 15,103.89, 20,843.61 and 8,390.13

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Solution

The fourth proportional to 15,103.89, 20,843.61 and 8,390.13 is: 11,578.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,103.89 : 20,843.61 = 8,390.13 : x
  2. Step 2: Convert to fraction form
    15,103.89/20,843.61 = 8,390.13/x
  3. Step 3: Cross multiply
    15,103.89x = 20,843.61 × 8,390.13
  4. Step 4: Simplify right side
    15,103.89x = 174,880,597.57
  5. Step 5: Solve for x
    x = 174,880,597.57/15,103.89
  6. Step 6: Final answer
    x = 11,578.51

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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.