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Finding the Fourth Proportional to 20,666.10, 30,999.15 and 6,813.30

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Solution

The fourth proportional to 20,666.10, 30,999.15 and 6,813.30 is: 10,219.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,666.10 : 30,999.15 = 6,813.30 : x
  2. Step 2: Convert to fraction form
    20,666.10/30,999.15 = 6,813.30/x
  3. Step 3: Cross multiply
    20,666.10x = 30,999.15 × 6,813.30
  4. Step 4: Simplify right side
    20,666.10x = 211,206,508.70
  5. Step 5: Solve for x
    x = 211,206,508.70/20,666.10
  6. Step 6: Final answer
    x = 10,219.95

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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.