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Finding the Fourth Proportional to 18,420.10, 27,630.12 and 8,553.98

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Solution

The fourth proportional to 18,420.10, 27,630.12 and 8,553.98 is: 12,830.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,420.10 : 27,630.12 = 8,553.98 : x
  2. Step 2: Convert to fraction form
    18,420.10/27,630.12 = 8,553.98/x
  3. Step 3: Cross multiply
    18,420.10x = 27,630.12 × 8,553.98
  4. Step 4: Simplify right side
    18,420.10x = 236,347,493.88
  5. Step 5: Solve for x
    x = 236,347,493.88/18,420.10
  6. Step 6: Final answer
    x = 12,830.96

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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.