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Finding the Fourth Proportional to 19,171.89, 28,764.98 and 8,638.76

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Solution

The fourth proportional to 19,171.89, 28,764.98 and 8,638.76 is: 12,961.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,171.89 : 28,764.98 = 8,638.76 : x
  2. Step 2: Convert to fraction form
    19,171.89/28,764.98 = 8,638.76/x
  3. Step 3: Cross multiply
    19,171.89x = 28,764.98 × 8,638.76
  4. Step 4: Simplify right side
    19,171.89x = 248,493,571.61
  5. Step 5: Solve for x
    x = 248,493,571.61/19,171.89
  6. Step 6: Final answer
    x = 12,961.35

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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.