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Finding the Fourth Proportional to 7,072.72, 9,759.88 and 4,420

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Solution

The fourth proportional to 7,072.72, 9,759.88 and 4,420 is: 6,099.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,072.72 : 9,759.88 = 4,420 : x
  2. Step 2: Convert to fraction form
    7,072.72/9,759.88 = 4,420/x
  3. Step 3: Cross multiply
    7,072.72x = 9,759.88 × 4,420
  4. Step 4: Simplify right side
    7,072.72x = 43,138,669.60
  5. Step 5: Solve for x
    x = 43,138,669.60/7,072.72
  6. Step 6: Final answer
    x = 6,099.30

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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.