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Finding the Fourth Proportional to 12,738.90, 19,071.90 and 11,426.70

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Solution

The fourth proportional to 12,738.90, 19,071.90 and 11,426.70 is: 17,107.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,738.90 : 19,071.90 = 11,426.70 : x
  2. Step 2: Convert to fraction form
    12,738.90/19,071.90 = 11,426.70/x
  3. Step 3: Cross multiply
    12,738.90x = 19,071.90 × 11,426.70
  4. Step 4: Simplify right side
    12,738.90x = 217,928,879.73
  5. Step 5: Solve for x
    x = 217,928,879.73/12,738.90
  6. Step 6: Final answer
    x = 17,107.35

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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.