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Finding the Fourth Proportional to 15,086.99, 20,819.16 and 8,372.13

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Solution

The fourth proportional to 15,086.99, 20,819.16 and 8,372.13 is: 11,553.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,086.99 : 20,819.16 = 8,372.13 : x
  2. Step 2: Convert to fraction form
    15,086.99/20,819.16 = 8,372.13/x
  3. Step 3: Cross multiply
    15,086.99x = 20,819.16 × 8,372.13
  4. Step 4: Simplify right side
    15,086.99x = 174,300,714.01
  5. Step 5: Solve for x
    x = 174,300,714.01/15,086.99
  6. Step 6: Final answer
    x = 11,553.05

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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.