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Finding the Fourth Proportional to 8,309.20, 12,398.69 and 8,260.60

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Solution

The fourth proportional to 8,309.20, 12,398.69 and 8,260.60 is: 12,326.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,309.20 : 12,398.69 = 8,260.60 : x
  2. Step 2: Convert to fraction form
    8,309.20/12,398.69 = 8,260.60/x
  3. Step 3: Cross multiply
    8,309.20x = 12,398.69 × 8,260.60
  4. Step 4: Simplify right side
    8,309.20x = 102,420,618.61
  5. Step 5: Solve for x
    x = 102,420,618.61/8,309.20
  6. Step 6: Final answer
    x = 12,326.17

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.