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Finding the Fourth Proportional to 7,072.60, 9,759.28 and 3,928.20

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Solution

The fourth proportional to 7,072.60, 9,759.28 and 3,928.20 is: 5,420.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,072.60 : 9,759.28 = 3,928.20 : x
  2. Step 2: Convert to fraction form
    7,072.60/9,759.28 = 3,928.20/x
  3. Step 3: Cross multiply
    7,072.60x = 9,759.28 × 3,928.20
  4. Step 4: Simplify right side
    7,072.60x = 38,336,403.70
  5. Step 5: Solve for x
    x = 38,336,403.70/7,072.60
  6. Step 6: Final answer
    x = 5,420.41

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1.5x scale

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.