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Finding the Fourth Proportional to 17,991.60, 26,979.30 and 8,125.80

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Solution

The fourth proportional to 17,991.60, 26,979.30 and 8,125.80 is: 12,185.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    17,991.60 : 26,979.30 = 8,125.80 : x
  2. Step 2: Convert to fraction form
    17,991.60/26,979.30 = 8,125.80/x
  3. Step 3: Cross multiply
    17,991.60x = 26,979.30 × 8,125.80
  4. Step 4: Simplify right side
    17,991.60x = 219,228,395.94
  5. Step 5: Solve for x
    x = 219,228,395.94/17,991.60
  6. Step 6: Final answer
    x = 12,185.04

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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.