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Finding the Fourth Proportional to 20,103.91, 30,170.45 and 11,355.91

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Solution

The fourth proportional to 20,103.91, 30,170.45 and 11,355.91 is: 17,042.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,103.91 : 30,170.45 = 11,355.91 : x
  2. Step 2: Convert to fraction form
    20,103.91/30,170.45 = 11,355.91/x
  3. Step 3: Cross multiply
    20,103.91x = 30,170.45 × 11,355.91
  4. Step 4: Simplify right side
    20,103.91x = 342,612,858.08
  5. Step 5: Solve for x
    x = 342,612,858.08/20,103.91
  6. Step 6: Final answer
    x = 17,042.10

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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.