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Finding the Fourth Proportional to 20,451.10, 30,672.60 and 9,921.10

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Solution

The fourth proportional to 20,451.10, 30,672.60 and 9,921.10 is: 14,879.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,451.10 : 30,672.60 = 9,921.10 : x
  2. Step 2: Convert to fraction form
    20,451.10/30,672.60 = 9,921.10/x
  3. Step 3: Cross multiply
    20,451.10x = 30,672.60 × 9,921.10
  4. Step 4: Simplify right side
    20,451.10x = 304,305,931.86
  5. Step 5: Solve for x
    x = 304,305,931.86/20,451.10
  6. Step 6: Final answer
    x = 14,879.69

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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.