Home / 20,107.20-30,174.12-8,420.40

Finding the Fourth Proportional to 20,107.20, 30,174.12 and 8,420.40

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Solution

The fourth proportional to 20,107.20, 30,174.12 and 8,420.40 is: 12,636.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,107.20 : 30,174.12 = 8,420.40 : x
  2. Step 2: Convert to fraction form
    20,107.20/30,174.12 = 8,420.40/x
  3. Step 3: Cross multiply
    20,107.20x = 30,174.12 × 8,420.40
  4. Step 4: Simplify right side
    20,107.20x = 254,078,160.05
  5. Step 5: Solve for x
    x = 254,078,160.05/20,107.20
  6. Step 6: Final answer
    x = 12,636.18

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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.