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Finding the Fourth Proportional to 21,690.53, 32,522.11 and 12,187.79

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Solution

The fourth proportional to 21,690.53, 32,522.11 and 12,187.79 is: 18,273.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,690.53 : 32,522.11 = 12,187.79 : x
  2. Step 2: Convert to fraction form
    21,690.53/32,522.11 = 12,187.79/x
  3. Step 3: Cross multiply
    21,690.53x = 32,522.11 × 12,187.79
  4. Step 4: Simplify right side
    21,690.53x = 396,372,453.96
  5. Step 5: Solve for x
    x = 396,372,453.96/21,690.53
  6. Step 6: Final answer
    x = 18,273.99

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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.