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Finding the Fourth Proportional to 18,692.72, 28,035.12 and 7,006.80

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Solution

The fourth proportional to 18,692.72, 28,035.12 and 7,006.80 is: 10,508.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,692.72 : 28,035.12 = 7,006.80 : x
  2. Step 2: Convert to fraction form
    18,692.72/28,035.12 = 7,006.80/x
  3. Step 3: Cross multiply
    18,692.72x = 28,035.12 × 7,006.80
  4. Step 4: Simplify right side
    18,692.72x = 196,436,478.82
  5. Step 5: Solve for x
    x = 196,436,478.82/18,692.72
  6. Step 6: Final answer
    x = 10,508.72

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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.