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Finding the Fourth Proportional to 15,853.86, 21,879.81 and 8,781.66

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Solution

The fourth proportional to 15,853.86, 21,879.81 and 8,781.66 is: 12,119.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,853.86 : 21,879.81 = 8,781.66 : x
  2. Step 2: Convert to fraction form
    15,853.86/21,879.81 = 8,781.66/x
  3. Step 3: Cross multiply
    15,853.86x = 21,879.81 × 8,781.66
  4. Step 4: Simplify right side
    15,853.86x = 192,141,052.28
  5. Step 5: Solve for x
    x = 192,141,052.28/15,853.86
  6. Step 6: Final answer
    x = 12,119.51

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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.