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Finding the Fourth Proportional to 15,763.42, 21,754.50 and 8,689.83

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Solution

The fourth proportional to 15,763.42, 21,754.50 and 8,689.83 is: 11,992.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,763.42 : 21,754.50 = 8,689.83 : x
  2. Step 2: Convert to fraction form
    15,763.42/21,754.50 = 8,689.83/x
  3. Step 3: Cross multiply
    15,763.42x = 21,754.50 × 8,689.83
  4. Step 4: Simplify right side
    15,763.42x = 189,042,906.74
  5. Step 5: Solve for x
    x = 189,042,906.74/15,763.42
  6. Step 6: Final answer
    x = 11,992.51

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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.