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Finding the Fourth Proportional to 8,115, 12,172.50 and 2,643

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Solution

The fourth proportional to 8,115, 12,172.50 and 2,643 is: 3,964.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,115 : 12,172.50 = 2,643 : x
  2. Step 2: Convert to fraction form
    8,115/12,172.50 = 2,643/x
  3. Step 3: Cross multiply
    8,115x = 12,172.50 × 2,643
  4. Step 4: Simplify right side
    8,115x = 32,171,917.50
  5. Step 5: Solve for x
    x = 32,171,917.50/8,115
  6. Step 6: Final answer
    x = 3,964.50

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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.