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Finding the Fourth Proportional to 20,420.67, 30,623.22 and 12,103.01

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Solution

The fourth proportional to 20,420.67, 30,623.22 and 12,103.01 is: 18,149.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,420.67 : 30,623.22 = 12,103.01 : x
  2. Step 2: Convert to fraction form
    20,420.67/30,623.22 = 12,103.01/x
  3. Step 3: Cross multiply
    20,420.67x = 30,623.22 × 12,103.01
  4. Step 4: Simplify right side
    20,420.67x = 370,633,137.89
  5. Step 5: Solve for x
    x = 370,633,137.89/20,420.67
  6. Step 6: Final answer
    x = 18,149.90

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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.