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Finding the Fourth Proportional to 12,694.70, 19,042.86 and 3,928.88

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Solution

The fourth proportional to 12,694.70, 19,042.86 and 3,928.88 is: 5,893.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,694.70 : 19,042.86 = 3,928.88 : x
  2. Step 2: Convert to fraction form
    12,694.70/19,042.86 = 3,928.88/x
  3. Step 3: Cross multiply
    12,694.70x = 19,042.86 × 3,928.88
  4. Step 4: Simplify right side
    12,694.70x = 74,817,111.80
  5. Step 5: Solve for x
    x = 74,817,111.80/12,694.70
  6. Step 6: Final answer
    x = 5,893.57

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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.