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Finding the Fourth Proportional to 18,980.67, 28,432.73 and 15,891.54

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Solution

The fourth proportional to 18,980.67, 28,432.73 and 15,891.54 is: 23,805.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,980.67 : 28,432.73 = 15,891.54 : x
  2. Step 2: Convert to fraction form
    18,980.67/28,432.73 = 15,891.54/x
  3. Step 3: Cross multiply
    18,980.67x = 28,432.73 × 15,891.54
  4. Step 4: Simplify right side
    18,980.67x = 451,839,866.10
  5. Step 5: Solve for x
    x = 451,839,866.10/18,980.67
  6. Step 6: Final answer
    x = 23,805.26

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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.