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Finding the Fourth Proportional to 13,612.36, 18,786.72 and 7,644.28

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Solution

The fourth proportional to 13,612.36, 18,786.72 and 7,644.28 is: 10,550.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,612.36 : 18,786.72 = 7,644.28 : x
  2. Step 2: Convert to fraction form
    13,612.36/18,786.72 = 7,644.28/x
  3. Step 3: Cross multiply
    13,612.36x = 18,786.72 × 7,644.28
  4. Step 4: Simplify right side
    13,612.36x = 143,610,947.96
  5. Step 5: Solve for x
    x = 143,610,947.96/13,612.36
  6. Step 6: Final answer
    x = 10,550.04

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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.