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Finding the Fourth Proportional to 18,970.44, 28,470.18 and 8,589.48

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Solution

The fourth proportional to 18,970.44, 28,470.18 and 8,589.48 is: 12,890.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,970.44 : 28,470.18 = 8,589.48 : x
  2. Step 2: Convert to fraction form
    18,970.44/28,470.18 = 8,589.48/x
  3. Step 3: Cross multiply
    18,970.44x = 28,470.18 × 8,589.48
  4. Step 4: Simplify right side
    18,970.44x = 244,544,041.71
  5. Step 5: Solve for x
    x = 244,544,041.71/18,970.44
  6. Step 6: Final answer
    x = 12,890.79

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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.