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Finding the Fourth Proportional to 18,791.28, 28,192.32 and 8,916.98

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Solution

The fourth proportional to 18,791.28, 28,192.32 and 8,916.98 is: 13,378.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,791.28 : 28,192.32 = 8,916.98 : x
  2. Step 2: Convert to fraction form
    18,791.28/28,192.32 = 8,916.98/x
  3. Step 3: Cross multiply
    18,791.28x = 28,192.32 × 8,916.98
  4. Step 4: Simplify right side
    18,791.28x = 251,390,212.63
  5. Step 5: Solve for x
    x = 251,390,212.63/18,791.28
  6. Step 6: Final answer
    x = 13,378.02

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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.