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Finding the Fourth Proportional to 18,757.40, 28,136.17 and 7,664.12

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Solution

The fourth proportional to 18,757.40, 28,136.17 and 7,664.12 is: 11,496.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,757.40 : 28,136.17 = 7,664.12 : x
  2. Step 2: Convert to fraction form
    18,757.40/28,136.17 = 7,664.12/x
  3. Step 3: Cross multiply
    18,757.40x = 28,136.17 × 7,664.12
  4. Step 4: Simplify right side
    18,757.40x = 215,638,842.54
  5. Step 5: Solve for x
    x = 215,638,842.54/18,757.40
  6. Step 6: Final answer
    x = 11,496.20

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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.