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Finding the Fourth Proportional to 12,138.08, 18,207.20 and 4,347.20

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Solution

The fourth proportional to 12,138.08, 18,207.20 and 4,347.20 is: 6,520.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,138.08 : 18,207.20 = 4,347.20 : x
  2. Step 2: Convert to fraction form
    12,138.08/18,207.20 = 4,347.20/x
  3. Step 3: Cross multiply
    12,138.08x = 18,207.20 × 4,347.20
  4. Step 4: Simplify right side
    12,138.08x = 79,150,339.84
  5. Step 5: Solve for x
    x = 79,150,339.84/12,138.08
  6. Step 6: Final answer
    x = 6,520.83

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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.