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Finding the Fourth Proportional to 18,978.39, 28,470.02 and 7,290.09

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Solution

The fourth proportional to 18,978.39, 28,470.02 and 7,290.09 is: 10,936.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,978.39 : 28,470.02 = 7,290.09 : x
  2. Step 2: Convert to fraction form
    18,978.39/28,470.02 = 7,290.09/x
  3. Step 3: Cross multiply
    18,978.39x = 28,470.02 × 7,290.09
  4. Step 4: Simplify right side
    18,978.39x = 207,548,971.65
  5. Step 5: Solve for x
    x = 207,548,971.65/18,978.39
  6. Step 6: Final answer
    x = 10,936.07

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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.