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Finding the Fourth Proportional to 15,763.69, 21,753.90 and 8,690.12

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Solution

The fourth proportional to 15,763.69, 21,753.90 and 8,690.12 is: 11,992.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,763.69 : 21,753.90 = 8,690.12 : x
  2. Step 2: Convert to fraction form
    15,763.69/21,753.90 = 8,690.12/x
  3. Step 3: Cross multiply
    15,763.69x = 21,753.90 × 8,690.12
  4. Step 4: Simplify right side
    15,763.69x = 189,043,974.28
  5. Step 5: Solve for x
    x = 189,043,974.28/15,763.69
  6. Step 6: Final answer
    x = 11,992.37

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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.