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Finding the Fourth Proportional to 19,172.88, 28,747.20 and 8,640.72

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Solution

The fourth proportional to 19,172.88, 28,747.20 and 8,640.72 is: 12,955.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,172.88 : 28,747.20 = 8,640.72 : x
  2. Step 2: Convert to fraction form
    19,172.88/28,747.20 = 8,640.72/x
  3. Step 3: Cross multiply
    19,172.88x = 28,747.20 × 8,640.72
  4. Step 4: Simplify right side
    19,172.88x = 248,396,505.98
  5. Step 5: Solve for x
    x = 248,396,505.98/19,172.88
  6. Step 6: Final answer
    x = 12,955.62

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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.