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Finding the Fourth Proportional to 15,661.76, 21,610.09 and 8,949.59

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Solution

The fourth proportional to 15,661.76, 21,610.09 and 8,949.59 is: 12,348.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,661.76 : 21,610.09 = 8,949.59 : x
  2. Step 2: Convert to fraction form
    15,661.76/21,610.09 = 8,949.59/x
  3. Step 3: Cross multiply
    15,661.76x = 21,610.09 × 8,949.59
  4. Step 4: Simplify right side
    15,661.76x = 193,401,429.54
  5. Step 5: Solve for x
    x = 193,401,429.54/15,661.76
  6. Step 6: Final answer
    x = 12,348.64

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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.