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Finding the Fourth Proportional to 18,764.66, 28,136.59 and 7,679.12

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Solution

The fourth proportional to 18,764.66, 28,136.59 and 7,679.12 is: 11,514.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,764.66 : 28,136.59 = 7,679.12 : x
  2. Step 2: Convert to fraction form
    18,764.66/28,136.59 = 7,679.12/x
  3. Step 3: Cross multiply
    18,764.66x = 28,136.59 × 7,679.12
  4. Step 4: Simplify right side
    18,764.66x = 216,064,251.00
  5. Step 5: Solve for x
    x = 216,064,251.00/18,764.66
  6. Step 6: Final answer
    x = 11,514.42

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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.