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Finding the Fourth Proportional to 15,939.86, 21,996.99 and 8,866.13

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Solution

The fourth proportional to 15,939.86, 21,996.99 and 8,866.13 is: 12,235.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,939.86 : 21,996.99 = 8,866.13 : x
  2. Step 2: Convert to fraction form
    15,939.86/21,996.99 = 8,866.13/x
  3. Step 3: Cross multiply
    15,939.86x = 21,996.99 × 8,866.13
  4. Step 4: Simplify right side
    15,939.86x = 195,028,062.96
  5. Step 5: Solve for x
    x = 195,028,062.96/15,939.86
  6. Step 6: Final answer
    x = 12,235.25

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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.