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Finding the Fourth Proportional to 20,129.70, 30,218.85 and 19,983.90

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Solution

The fourth proportional to 20,129.70, 30,218.85 and 19,983.90 is: 29,999.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,129.70 : 30,218.85 = 19,983.90 : x
  2. Step 2: Convert to fraction form
    20,129.70/30,218.85 = 19,983.90/x
  3. Step 3: Cross multiply
    20,129.70x = 30,218.85 × 19,983.90
  4. Step 4: Simplify right side
    20,129.70x = 603,890,476.52
  5. Step 5: Solve for x
    x = 603,890,476.52/20,129.70
  6. Step 6: Final answer
    x = 29,999.97

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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.