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Finding the Fourth Proportional to 17,178.80, 25,717.80 and 12,815.60

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Solution

The fourth proportional to 17,178.80, 25,717.80 and 12,815.60 is: 19,185.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    17,178.80 : 25,717.80 = 12,815.60 : x
  2. Step 2: Convert to fraction form
    17,178.80/25,717.80 = 12,815.60/x
  3. Step 3: Cross multiply
    17,178.80x = 25,717.80 × 12,815.60
  4. Step 4: Simplify right side
    17,178.80x = 329,589,037.68
  5. Step 5: Solve for x
    x = 329,589,037.68/17,178.80
  6. Step 6: Final answer
    x = 19,185.80

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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.