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Finding the Fourth Proportional to 18,964.92, 28,429.97 and 7,275.81

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Solution

The fourth proportional to 18,964.92, 28,429.97 and 7,275.81 is: 10,907.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,964.92 : 28,429.97 = 7,275.81 : x
  2. Step 2: Convert to fraction form
    18,964.92/28,429.97 = 7,275.81/x
  3. Step 3: Cross multiply
    18,964.92x = 28,429.97 × 7,275.81
  4. Step 4: Simplify right side
    18,964.92x = 206,851,023.65
  5. Step 5: Solve for x
    x = 206,851,023.65/18,964.92
  6. Step 6: Final answer
    x = 10,907.03

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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.