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Finding the Fourth Proportional to 15,790.92, 21,791.52 and 8,717.36

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Solution

The fourth proportional to 15,790.92, 21,791.52 and 8,717.36 is: 12,029.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,790.92 : 21,791.52 = 8,717.36 : x
  2. Step 2: Convert to fraction form
    15,790.92/21,791.52 = 8,717.36/x
  3. Step 3: Cross multiply
    15,790.92x = 21,791.52 × 8,717.36
  4. Step 4: Simplify right side
    15,790.92x = 189,964,415.83
  5. Step 5: Solve for x
    x = 189,964,415.83/15,790.92
  6. Step 6: Final answer
    x = 12,029.98

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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.