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Finding the Fourth Proportional to 13,616.54, 18,790.34 and 8,320.22

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Solution

The fourth proportional to 13,616.54, 18,790.34 and 8,320.22 is: 11,481.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,616.54 : 18,790.34 = 8,320.22 : x
  2. Step 2: Convert to fraction form
    13,616.54/18,790.34 = 8,320.22/x
  3. Step 3: Cross multiply
    13,616.54x = 18,790.34 × 8,320.22
  4. Step 4: Simplify right side
    13,616.54x = 156,339,762.67
  5. Step 5: Solve for x
    x = 156,339,762.67/13,616.54
  6. Step 6: Final answer
    x = 11,481.61

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.