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Finding the Fourth Proportional to 18,808.84, 28,213.31 and 4,768.88

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Solution

The fourth proportional to 18,808.84, 28,213.31 and 4,768.88 is: 7,153.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,808.84 : 28,213.31 = 4,768.88 : x
  2. Step 2: Convert to fraction form
    18,808.84/28,213.31 = 4,768.88/x
  3. Step 3: Cross multiply
    18,808.84x = 28,213.31 × 4,768.88
  4. Step 4: Simplify right side
    18,808.84x = 134,545,760.65
  5. Step 5: Solve for x
    x = 134,545,760.65/18,808.84
  6. Step 6: Final answer
    x = 7,153.33

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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.