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Finding the Fourth Proportional to 13,383.87, 18,469.88 and 7,415.61

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Solution

The fourth proportional to 13,383.87, 18,469.88 and 7,415.61 is: 10,233.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,383.87 : 18,469.88 = 7,415.61 : x
  2. Step 2: Convert to fraction form
    13,383.87/18,469.88 = 7,415.61/x
  3. Step 3: Cross multiply
    13,383.87x = 18,469.88 × 7,415.61
  4. Step 4: Simplify right side
    13,383.87x = 136,965,389.75
  5. Step 5: Solve for x
    x = 136,965,389.75/13,383.87
  6. Step 6: Final answer
    x = 10,233.62

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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.