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Finding the Fourth Proportional to 20,612.72, 30,930.36 and 8,764.64

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Solution

The fourth proportional to 20,612.72, 30,930.36 and 8,764.64 is: 13,151.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,612.72 : 30,930.36 = 8,764.64 : x
  2. Step 2: Convert to fraction form
    20,612.72/30,930.36 = 8,764.64/x
  3. Step 3: Cross multiply
    20,612.72x = 30,930.36 × 8,764.64
  4. Step 4: Simplify right side
    20,612.72x = 271,093,470.47
  5. Step 5: Solve for x
    x = 271,093,470.47/20,612.72
  6. Step 6: Final answer
    x = 13,151.76

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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.