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Finding the Fourth Proportional to 20,611.72, 30,911.50 and 8,765.47

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Solution

The fourth proportional to 20,611.72, 30,911.50 and 8,765.47 is: 13,145.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,611.72 : 30,911.50 = 8,765.47 : x
  2. Step 2: Convert to fraction form
    20,611.72/30,911.50 = 8,765.47/x
  3. Step 3: Cross multiply
    20,611.72x = 30,911.50 × 8,765.47
  4. Step 4: Simplify right side
    20,611.72x = 270,953,825.91
  5. Step 5: Solve for x
    x = 270,953,825.91/20,611.72
  6. Step 6: Final answer
    x = 13,145.62

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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.