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Finding the Fourth Proportional to 8,291, 12,436.50 and 2,819

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Solution

The fourth proportional to 8,291, 12,436.50 and 2,819 is: 4,228.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,291 : 12,436.50 = 2,819 : x
  2. Step 2: Convert to fraction form
    8,291/12,436.50 = 2,819/x
  3. Step 3: Cross multiply
    8,291x = 12,436.50 × 2,819
  4. Step 4: Simplify right side
    8,291x = 35,058,493.50
  5. Step 5: Solve for x
    x = 35,058,493.50/8,291
  6. Step 6: Final answer
    x = 4,228.50

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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.