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Finding the Fourth Proportional to 15,105, 20,845.49 and 8,391.14

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Solution

The fourth proportional to 15,105, 20,845.49 and 8,391.14 is: 11,580.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,105 : 20,845.49 = 8,391.14 : x
  2. Step 2: Convert to fraction form
    15,105/20,845.49 = 8,391.14/x
  3. Step 3: Cross multiply
    15,105x = 20,845.49 × 8,391.14
  4. Step 4: Simplify right side
    15,105x = 174,917,424.96
  5. Step 5: Solve for x
    x = 174,917,424.96/15,105
  6. Step 6: Final answer
    x = 11,580.10

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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.