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Finding the Fourth Proportional to 18,616.64, 25,696.95 and 11,920.30

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Solution

The fourth proportional to 18,616.64, 25,696.95 and 11,920.30 is: 16,453.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,616.64 : 25,696.95 = 11,920.30 : x
  2. Step 2: Convert to fraction form
    18,616.64/25,696.95 = 11,920.30/x
  3. Step 3: Cross multiply
    18,616.64x = 25,696.95 × 11,920.30
  4. Step 4: Simplify right side
    18,616.64x = 306,315,353.09
  5. Step 5: Solve for x
    x = 306,315,353.09/18,616.64
  6. Step 6: Final answer
    x = 16,453.85

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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.