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Finding the Fourth Proportional to 18,643.44, 25,728 and 10,145.64

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Solution

The fourth proportional to 18,643.44, 25,728 and 10,145.64 is: 14,001.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,643.44 : 25,728 = 10,145.64 : x
  2. Step 2: Convert to fraction form
    18,643.44/25,728 = 10,145.64/x
  3. Step 3: Cross multiply
    18,643.44x = 25,728 × 10,145.64
  4. Step 4: Simplify right side
    18,643.44x = 261,027,025.92
  5. Step 5: Solve for x
    x = 261,027,025.92/18,643.44
  6. Step 6: Final answer
    x = 14,001.01

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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.