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Finding the Fourth Proportional to 15,145.92, 20,891.52 and 8,856

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Solution

The fourth proportional to 15,145.92, 20,891.52 and 8,856 is: 12,215.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,145.92 : 20,891.52 = 8,856 : x
  2. Step 2: Convert to fraction form
    15,145.92/20,891.52 = 8,856/x
  3. Step 3: Cross multiply
    15,145.92x = 20,891.52 × 8,856
  4. Step 4: Simplify right side
    15,145.92x = 185,015,301.12
  5. Step 5: Solve for x
    x = 185,015,301.12/15,145.92
  6. Step 6: Final answer
    x = 12,215.52

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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.