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Finding the Fourth Proportional to 7,212.72, 9,954 and 4,069.20

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Solution

The fourth proportional to 7,212.72, 9,954 and 4,069.20 is: 5,615.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,212.72 : 9,954 = 4,069.20 : x
  2. Step 2: Convert to fraction form
    7,212.72/9,954 = 4,069.20/x
  3. Step 3: Cross multiply
    7,212.72x = 9,954 × 4,069.20
  4. Step 4: Simplify right side
    7,212.72x = 40,504,816.80
  5. Step 5: Solve for x
    x = 40,504,816.80/7,212.72
  6. Step 6: Final answer
    x = 5,615.75

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.