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Finding the Fourth Proportional to 20,108.20, 30,129.90 and 12,699.40

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Solution

The fourth proportional to 20,108.20, 30,129.90 and 12,699.40 is: 19,028.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,108.20 : 30,129.90 = 12,699.40 : x
  2. Step 2: Convert to fraction form
    20,108.20/30,129.90 = 12,699.40/x
  3. Step 3: Cross multiply
    20,108.20x = 30,129.90 × 12,699.40
  4. Step 4: Simplify right side
    20,108.20x = 382,631,652.06
  5. Step 5: Solve for x
    x = 382,631,652.06/20,108.20
  6. Step 6: Final answer
    x = 19,028.64

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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.