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Finding the Fourth Proportional to 15,704.70, 21,672.45 and 8,631.60

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Solution

The fourth proportional to 15,704.70, 21,672.45 and 8,631.60 is: 11,911.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,704.70 : 21,672.45 = 8,631.60 : x
  2. Step 2: Convert to fraction form
    15,704.70/21,672.45 = 8,631.60/x
  3. Step 3: Cross multiply
    15,704.70x = 21,672.45 × 8,631.60
  4. Step 4: Simplify right side
    15,704.70x = 187,067,919.42
  5. Step 5: Solve for x
    x = 187,067,919.42/15,704.70
  6. Step 6: Final answer
    x = 11,911.59

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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.