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Finding the Fourth Proportional to 12,696.75, 17,521.52 and 7,728.75

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Solution

The fourth proportional to 12,696.75, 17,521.52 and 7,728.75 is: 10,665.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,696.75 : 17,521.52 = 7,728.75 : x
  2. Step 2: Convert to fraction form
    12,696.75/17,521.52 = 7,728.75/x
  3. Step 3: Cross multiply
    12,696.75x = 17,521.52 × 7,728.75
  4. Step 4: Simplify right side
    12,696.75x = 135,419,409.06
  5. Step 5: Solve for x
    x = 135,419,409.06/12,696.75
  6. Step 6: Final answer
    x = 10,665.68

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.