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Finding the Fourth Proportional to 20,003.10, 30,004.65 and 18,123.90

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Solution

The fourth proportional to 20,003.10, 30,004.65 and 18,123.90 is: 27,185.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,003.10 : 30,004.65 = 18,123.90 : x
  2. Step 2: Convert to fraction form
    20,003.10/30,004.65 = 18,123.90/x
  3. Step 3: Cross multiply
    20,003.10x = 30,004.65 × 18,123.90
  4. Step 4: Simplify right side
    20,003.10x = 543,801,276.14
  5. Step 5: Solve for x
    x = 543,801,276.14/20,003.10
  6. Step 6: Final answer
    x = 27,185.85

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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.