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Finding the Fourth Proportional to 12,321.96, 18,455.17 and 8,640.61

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Solution

The fourth proportional to 12,321.96, 18,455.17 and 8,640.61 is: 12,941.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,321.96 : 18,455.17 = 8,640.61 : x
  2. Step 2: Convert to fraction form
    12,321.96/18,455.17 = 8,640.61/x
  3. Step 3: Cross multiply
    12,321.96x = 18,455.17 × 8,640.61
  4. Step 4: Simplify right side
    12,321.96x = 159,463,926.45
  5. Step 5: Solve for x
    x = 159,463,926.45/12,321.96
  6. Step 6: Final answer
    x = 12,941.44

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1.5x scale

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.