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Finding the Fourth Proportional to 18,651.84, 27,987.12 and 8,790

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Solution

The fourth proportional to 18,651.84, 27,987.12 and 8,790 is: 13,189.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,651.84 : 27,987.12 = 8,790 : x
  2. Step 2: Convert to fraction form
    18,651.84/27,987.12 = 8,790/x
  3. Step 3: Cross multiply
    18,651.84x = 27,987.12 × 8,790
  4. Step 4: Simplify right side
    18,651.84x = 246,006,784.80
  5. Step 5: Solve for x
    x = 246,006,784.80/18,651.84
  6. Step 6: Final answer
    x = 13,189.41

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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.