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Finding the Fourth Proportional to 18,622.80, 27,861.30 and 12,061.80

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Solution

The fourth proportional to 18,622.80, 27,861.30 and 12,061.80 is: 18,045.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,622.80 : 27,861.30 = 12,061.80 : x
  2. Step 2: Convert to fraction form
    18,622.80/27,861.30 = 12,061.80/x
  3. Step 3: Cross multiply
    18,622.80x = 27,861.30 × 12,061.80
  4. Step 4: Simplify right side
    18,622.80x = 336,057,428.34
  5. Step 5: Solve for x
    x = 336,057,428.34/18,622.80
  6. Step 6: Final answer
    x = 18,045.48

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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.