Home / 8,138.20-12,207.30-4,242.10

Finding the Fourth Proportional to 8,138.20, 12,207.30 and 4,242.10

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Solution

The fourth proportional to 8,138.20, 12,207.30 and 4,242.10 is: 6,363.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,138.20 : 12,207.30 = 4,242.10 : x
  2. Step 2: Convert to fraction form
    8,138.20/12,207.30 = 4,242.10/x
  3. Step 3: Cross multiply
    8,138.20x = 12,207.30 × 4,242.10
  4. Step 4: Simplify right side
    8,138.20x = 51,784,587.33
  5. Step 5: Solve for x
    x = 51,784,587.33/8,138.20
  6. Step 6: Final answer
    x = 6,363.15

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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.