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Finding the Fourth Proportional to 18,680, 28,028.04 and 6,991.76

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Solution

The fourth proportional to 18,680, 28,028.04 and 6,991.76 is: 10,490.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,680 : 28,028.04 = 6,991.76 : x
  2. Step 2: Convert to fraction form
    18,680/28,028.04 = 6,991.76/x
  3. Step 3: Cross multiply
    18,680x = 28,028.04 × 6,991.76
  4. Step 4: Simplify right side
    18,680x = 195,965,328.95
  5. Step 5: Solve for x
    x = 195,965,328.95/18,680
  6. Step 6: Final answer
    x = 10,490.65

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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.