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Finding the Fourth Proportional to 18,689, 28,033.50 and 7,601.72

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Solution

The fourth proportional to 18,689, 28,033.50 and 7,601.72 is: 11,402.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,689 : 28,033.50 = 7,601.72 : x
  2. Step 2: Convert to fraction form
    18,689/28,033.50 = 7,601.72/x
  3. Step 3: Cross multiply
    18,689x = 28,033.50 × 7,601.72
  4. Step 4: Simplify right side
    18,689x = 213,102,817.62
  5. Step 5: Solve for x
    x = 213,102,817.62/18,689
  6. Step 6: Final answer
    x = 11,402.58

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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.