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Finding the Fourth Proportional to 15,105.72, 20,845.80 and 8,391.18

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Solution

The fourth proportional to 15,105.72, 20,845.80 and 8,391.18 is: 11,579.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,105.72 : 20,845.80 = 8,391.18 : x
  2. Step 2: Convert to fraction form
    15,105.72/20,845.80 = 8,391.18/x
  3. Step 3: Cross multiply
    15,105.72x = 20,845.80 × 8,391.18
  4. Step 4: Simplify right side
    15,105.72x = 174,920,860.04
  5. Step 5: Solve for x
    x = 174,920,860.04/15,105.72
  6. Step 6: Final answer
    x = 11,579.78

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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.