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Finding the Fourth Proportional to 12,620.20, 18,930.30 and 11,259.40

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Solution

The fourth proportional to 12,620.20, 18,930.30 and 11,259.40 is: 16,889.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,620.20 : 18,930.30 = 11,259.40 : x
  2. Step 2: Convert to fraction form
    12,620.20/18,930.30 = 11,259.40/x
  3. Step 3: Cross multiply
    12,620.20x = 18,930.30 × 11,259.40
  4. Step 4: Simplify right side
    12,620.20x = 213,143,819.82
  5. Step 5: Solve for x
    x = 213,143,819.82/12,620.20
  6. Step 6: Final answer
    x = 16,889.10

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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.