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Finding the Fourth Proportional to 19,172.25, 28,760.81 and 5,321.25

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Solution

The fourth proportional to 19,172.25, 28,760.81 and 5,321.25 is: 7,982.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,172.25 : 28,760.81 = 5,321.25 : x
  2. Step 2: Convert to fraction form
    19,172.25/28,760.81 = 5,321.25/x
  3. Step 3: Cross multiply
    19,172.25x = 28,760.81 × 5,321.25
  4. Step 4: Simplify right side
    19,172.25x = 153,043,433.61
  5. Step 5: Solve for x
    x = 153,043,433.61/19,172.25
  6. Step 6: Final answer
    x = 7,982.55

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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.