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Finding the Fourth Proportional to 18,909.52, 28,360.62 and 7,219.96

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Solution

The fourth proportional to 18,909.52, 28,360.62 and 7,219.96 is: 10,828.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,909.52 : 28,360.62 = 7,219.96 : x
  2. Step 2: Convert to fraction form
    18,909.52/28,360.62 = 7,219.96/x
  3. Step 3: Cross multiply
    18,909.52x = 28,360.62 × 7,219.96
  4. Step 4: Simplify right side
    18,909.52x = 204,762,541.98
  5. Step 5: Solve for x
    x = 204,762,541.98/18,909.52
  6. Step 6: Final answer
    x = 10,828.54

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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.