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Finding the Fourth Proportional to 21,179, 31,768.50 and 8,867

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Solution

The fourth proportional to 21,179, 31,768.50 and 8,867 is: 13,300.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,179 : 31,768.50 = 8,867 : x
  2. Step 2: Convert to fraction form
    21,179/31,768.50 = 8,867/x
  3. Step 3: Cross multiply
    21,179x = 31,768.50 × 8,867
  4. Step 4: Simplify right side
    21,179x = 281,691,289.50
  5. Step 5: Solve for x
    x = 281,691,289.50/21,179
  6. Step 6: Final answer
    x = 13,300.50

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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.