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Finding the Fourth Proportional to 13,728.44, 18,947.74 and 7,760.09

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Solution

The fourth proportional to 13,728.44, 18,947.74 and 7,760.09 is: 10,710.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,728.44 : 18,947.74 = 7,760.09 : x
  2. Step 2: Convert to fraction form
    13,728.44/18,947.74 = 7,760.09/x
  3. Step 3: Cross multiply
    13,728.44x = 18,947.74 × 7,760.09
  4. Step 4: Simplify right side
    13,728.44x = 147,036,150.83
  5. Step 5: Solve for x
    x = 147,036,150.83/13,728.44
  6. Step 6: Final answer
    x = 10,710.33

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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.