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Finding the Fourth Proportional to 18,919.98, 28,384.11 and 5,772.03

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Solution

The fourth proportional to 18,919.98, 28,384.11 and 5,772.03 is: 8,659.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,919.98 : 28,384.11 = 5,772.03 : x
  2. Step 2: Convert to fraction form
    18,919.98/28,384.11 = 5,772.03/x
  3. Step 3: Cross multiply
    18,919.98x = 28,384.11 × 5,772.03
  4. Step 4: Simplify right side
    18,919.98x = 163,833,934.44
  5. Step 5: Solve for x
    x = 163,833,934.44/18,919.98
  6. Step 6: Final answer
    x = 8,659.31

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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.