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Finding the Fourth Proportional to 15,008.42, 20,714.49 and 8,639.30

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Solution

The fourth proportional to 15,008.42, 20,714.49 and 8,639.30 is: 11,923.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,008.42 : 20,714.49 = 8,639.30 : x
  2. Step 2: Convert to fraction form
    15,008.42/20,714.49 = 8,639.30/x
  3. Step 3: Cross multiply
    15,008.42x = 20,714.49 × 8,639.30
  4. Step 4: Simplify right side
    15,008.42x = 178,958,589.88
  5. Step 5: Solve for x
    x = 178,958,589.88/15,008.42
  6. Step 6: Final answer
    x = 11,923.88

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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.