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Finding the Fourth Proportional to 13,756.11, 18,983.70 and 8,979.11

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Solution

The fourth proportional to 13,756.11, 18,983.70 and 8,979.11 is: 12,391.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,756.11 : 18,983.70 = 8,979.11 : x
  2. Step 2: Convert to fraction form
    13,756.11/18,983.70 = 8,979.11/x
  3. Step 3: Cross multiply
    13,756.11x = 18,983.70 × 8,979.11
  4. Step 4: Simplify right side
    13,756.11x = 170,456,635.59
  5. Step 5: Solve for x
    x = 170,456,635.59/13,756.11
  6. Step 6: Final answer
    x = 12,391.34

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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.