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Finding the Fourth Proportional to 12,763.15, 19,111.91 and 7,817.79

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Solution

The fourth proportional to 12,763.15, 19,111.91 and 7,817.79 is: 11,706.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,763.15 : 19,111.91 = 7,817.79 : x
  2. Step 2: Convert to fraction form
    12,763.15/19,111.91 = 7,817.79/x
  3. Step 3: Cross multiply
    12,763.15x = 19,111.91 × 7,817.79
  4. Step 4: Simplify right side
    12,763.15x = 149,412,898.88
  5. Step 5: Solve for x
    x = 149,412,898.88/12,763.15
  6. Step 6: Final answer
    x = 11,706.58

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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.