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Finding the Fourth Proportional to 8,319, 12,478.50 and 2,163

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Solution

The fourth proportional to 8,319, 12,478.50 and 2,163 is: 3,244.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,319 : 12,478.50 = 2,163 : x
  2. Step 2: Convert to fraction form
    8,319/12,478.50 = 2,163/x
  3. Step 3: Cross multiply
    8,319x = 12,478.50 × 2,163
  4. Step 4: Simplify right side
    8,319x = 26,990,995.50
  5. Step 5: Solve for x
    x = 26,990,995.50/8,319
  6. Step 6: Final answer
    x = 3,244.50

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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.