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Finding the Fourth Proportional to 13,616.70, 18,786.12 and 8,903.70

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Solution

The fourth proportional to 13,616.70, 18,786.12 and 8,903.70 is: 12,283.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,616.70 : 18,786.12 = 8,903.70 : x
  2. Step 2: Convert to fraction form
    13,616.70/18,786.12 = 8,903.70/x
  3. Step 3: Cross multiply
    13,616.70x = 18,786.12 × 8,903.70
  4. Step 4: Simplify right side
    13,616.70x = 167,265,976.64
  5. Step 5: Solve for x
    x = 167,265,976.64/13,616.70
  6. Step 6: Final answer
    x = 12,283.88

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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.