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Finding the Fourth Proportional to 18,685.76, 27,972.68 and 18,021.15

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Solution

The fourth proportional to 18,685.76, 27,972.68 and 18,021.15 is: 26,977.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,685.76 : 27,972.68 = 18,021.15 : x
  2. Step 2: Convert to fraction form
    18,685.76/27,972.68 = 18,021.15/x
  3. Step 3: Cross multiply
    18,685.76x = 27,972.68 × 18,021.15
  4. Step 4: Simplify right side
    18,685.76x = 504,099,772.08
  5. Step 5: Solve for x
    x = 504,099,772.08/18,685.76
  6. Step 6: Final answer
    x = 26,977.76

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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.