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Finding the Fourth Proportional to 15,105.86, 20,845.18 and 8,391.10

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Solution

The fourth proportional to 15,105.86, 20,845.18 and 8,391.10 is: 11,579.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,105.86 : 20,845.18 = 8,391.10 : x
  2. Step 2: Convert to fraction form
    15,105.86/20,845.18 = 8,391.10/x
  3. Step 3: Cross multiply
    15,105.86x = 20,845.18 × 8,391.10
  4. Step 4: Simplify right side
    15,105.86x = 174,913,989.90
  5. Step 5: Solve for x
    x = 174,913,989.90/15,105.86
  6. Step 6: Final answer
    x = 11,579.21

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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.