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Finding the Fourth Proportional to 18,772.52, 28,172.62 and 8,911.88

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Solution

The fourth proportional to 18,772.52, 28,172.62 and 8,911.88 is: 13,374.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,772.52 : 28,172.62 = 8,911.88 : x
  2. Step 2: Convert to fraction form
    18,772.52/28,172.62 = 8,911.88/x
  3. Step 3: Cross multiply
    18,772.52x = 28,172.62 × 8,911.88
  4. Step 4: Simplify right side
    18,772.52x = 251,071,008.73
  5. Step 5: Solve for x
    x = 251,071,008.73/18,772.52
  6. Step 6: Final answer
    x = 13,374.39

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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.