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Finding the Fourth Proportional to 15,864.86, 21,893.46 and 8,791.28

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Solution

The fourth proportional to 15,864.86, 21,893.46 and 8,791.28 is: 12,131.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,864.86 : 21,893.46 = 8,791.28 : x
  2. Step 2: Convert to fraction form
    15,864.86/21,893.46 = 8,791.28/x
  3. Step 3: Cross multiply
    15,864.86x = 21,893.46 × 8,791.28
  4. Step 4: Simplify right side
    15,864.86x = 192,471,674.02
  5. Step 5: Solve for x
    x = 192,471,674.02/15,864.86
  6. Step 6: Final answer
    x = 12,131.95

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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.