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Finding the Fourth Proportional to 20,021.70, 30,000.15 and 12,612.90

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Solution

The fourth proportional to 20,021.70, 30,000.15 and 12,612.90 is: 18,898.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,021.70 : 30,000.15 = 12,612.90 : x
  2. Step 2: Convert to fraction form
    20,021.70/30,000.15 = 12,612.90/x
  3. Step 3: Cross multiply
    20,021.70x = 30,000.15 × 12,612.90
  4. Step 4: Simplify right side
    20,021.70x = 378,388,891.94
  5. Step 5: Solve for x
    x = 378,388,891.94/20,021.70
  6. Step 6: Final answer
    x = 18,898.94

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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.