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Finding the Fourth Proportional to 15,201.62, 20,978.04 and 8,487.36

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Solution

The fourth proportional to 15,201.62, 20,978.04 and 8,487.36 is: 11,712.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,201.62 : 20,978.04 = 8,487.36 : x
  2. Step 2: Convert to fraction form
    15,201.62/20,978.04 = 8,487.36/x
  3. Step 3: Cross multiply
    15,201.62x = 20,978.04 × 8,487.36
  4. Step 4: Simplify right side
    15,201.62x = 178,048,102.66
  5. Step 5: Solve for x
    x = 178,048,102.66/15,201.62
  6. Step 6: Final answer
    x = 11,712.44

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.