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Finding the Fourth Proportional to 15,191.20, 20,963.81 and 8,476.75

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Solution

The fourth proportional to 15,191.20, 20,963.81 and 8,476.75 is: 11,697.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,191.20 : 20,963.81 = 8,476.75 : x
  2. Step 2: Convert to fraction form
    15,191.20/20,963.81 = 8,476.75/x
  3. Step 3: Cross multiply
    15,191.20x = 20,963.81 × 8,476.75
  4. Step 4: Simplify right side
    15,191.20x = 177,704,976.42
  5. Step 5: Solve for x
    x = 177,704,976.42/15,191.20
  6. Step 6: Final answer
    x = 11,697.89

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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.