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Finding the Fourth Proportional to 15,865.36, 21,893.20 and 8,791.68

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Solution

The fourth proportional to 15,865.36, 21,893.20 and 8,791.68 is: 12,131.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,865.36 : 21,893.20 = 8,791.68 : x
  2. Step 2: Convert to fraction form
    15,865.36/21,893.20 = 8,791.68/x
  3. Step 3: Cross multiply
    15,865.36x = 21,893.20 × 8,791.68
  4. Step 4: Simplify right side
    15,865.36x = 192,478,008.58
  5. Step 5: Solve for x
    x = 192,478,008.58/15,865.36
  6. Step 6: Final answer
    x = 12,131.97

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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.