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Finding the Fourth Proportional to 18,768.78, 28,136.79 and 17,724.51

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Solution

The fourth proportional to 18,768.78, 28,136.79 and 17,724.51 is: 26,571.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,768.78 : 28,136.79 = 17,724.51 : x
  2. Step 2: Convert to fraction form
    18,768.78/28,136.79 = 17,724.51/x
  3. Step 3: Cross multiply
    18,768.78x = 28,136.79 × 17,724.51
  4. Step 4: Simplify right side
    18,768.78x = 498,710,815.72
  5. Step 5: Solve for x
    x = 498,710,815.72/18,768.78
  6. Step 6: Final answer
    x = 26,571.30

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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.