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Finding the Fourth Proportional to 20,636, 30,954.72 and 6,786.08

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Solution

The fourth proportional to 20,636, 30,954.72 and 6,786.08 is: 10,179.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,636 : 30,954.72 = 6,786.08 : x
  2. Step 2: Convert to fraction form
    20,636/30,954.72 = 6,786.08/x
  3. Step 3: Cross multiply
    20,636x = 30,954.72 × 6,786.08
  4. Step 4: Simplify right side
    20,636x = 210,061,206.30
  5. Step 5: Solve for x
    x = 210,061,206.30/20,636
  6. Step 6: Final answer
    x = 10,179.36

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.