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Finding the Fourth Proportional to 15,978.88, 22,051.11 and 8,905.29

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Solution

The fourth proportional to 15,978.88, 22,051.11 and 8,905.29 is: 12,289.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,978.88 : 22,051.11 = 8,905.29 : x
  2. Step 2: Convert to fraction form
    15,978.88/22,051.11 = 8,905.29/x
  3. Step 3: Cross multiply
    15,978.88x = 22,051.11 × 8,905.29
  4. Step 4: Simplify right side
    15,978.88x = 196,371,529.37
  5. Step 5: Solve for x
    x = 196,371,529.37/15,978.88
  6. Step 6: Final answer
    x = 12,289.44

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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.