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Finding the Fourth Proportional to 18,486.20, 27,729.30 and 12,654.20

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Solution

The fourth proportional to 18,486.20, 27,729.30 and 12,654.20 is: 18,981.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,486.20 : 27,729.30 = 12,654.20 : x
  2. Step 2: Convert to fraction form
    18,486.20/27,729.30 = 12,654.20/x
  3. Step 3: Cross multiply
    18,486.20x = 27,729.30 × 12,654.20
  4. Step 4: Simplify right side
    18,486.20x = 350,892,108.06
  5. Step 5: Solve for x
    x = 350,892,108.06/18,486.20
  6. Step 6: Final answer
    x = 18,981.30

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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.