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Finding the Fourth Proportional to 18,830.20, 28,245.30 and 12,998.20

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Solution

The fourth proportional to 18,830.20, 28,245.30 and 12,998.20 is: 19,497.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,830.20 : 28,245.30 = 12,998.20 : x
  2. Step 2: Convert to fraction form
    18,830.20/28,245.30 = 12,998.20/x
  3. Step 3: Cross multiply
    18,830.20x = 28,245.30 × 12,998.20
  4. Step 4: Simplify right side
    18,830.20x = 367,138,058.46
  5. Step 5: Solve for x
    x = 367,138,058.46/18,830.20
  6. Step 6: Final answer
    x = 19,497.30

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Similar ratio
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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.