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Finding the Fourth Proportional to 18,647.30, 27,970.97 and 12,786.14

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Solution

The fourth proportional to 18,647.30, 27,970.97 and 12,786.14 is: 19,179.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,647.30 : 27,970.97 = 12,786.14 : x
  2. Step 2: Convert to fraction form
    18,647.30/27,970.97 = 12,786.14/x
  3. Step 3: Cross multiply
    18,647.30x = 27,970.97 × 12,786.14
  4. Step 4: Simplify right side
    18,647.30x = 357,640,744.35
  5. Step 5: Solve for x
    x = 357,640,744.35/18,647.30
  6. Step 6: Final answer
    x = 19,179.22

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1.5x scale

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.