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Finding the Fourth Proportional to 20,586.60, 30,859.08 and 8,115.42

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Solution

The fourth proportional to 20,586.60, 30,859.08 and 8,115.42 is: 12,164.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,586.60 : 30,859.08 = 8,115.42 : x
  2. Step 2: Convert to fraction form
    20,586.60/30,859.08 = 8,115.42/x
  3. Step 3: Cross multiply
    20,586.60x = 30,859.08 × 8,115.42
  4. Step 4: Simplify right side
    20,586.60x = 250,434,395.01
  5. Step 5: Solve for x
    x = 250,434,395.01/20,586.60
  6. Step 6: Final answer
    x = 12,164.92

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.