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Finding the Fourth Proportional to 7,240.75, 9,992.24 and 3,928.75

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Solution

The fourth proportional to 7,240.75, 9,992.24 and 3,928.75 is: 5,421.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,240.75 : 9,992.24 = 3,928.75 : x
  2. Step 2: Convert to fraction form
    7,240.75/9,992.24 = 3,928.75/x
  3. Step 3: Cross multiply
    7,240.75x = 9,992.24 × 3,928.75
  4. Step 4: Simplify right side
    7,240.75x = 39,257,012.90
  5. Step 5: Solve for x
    x = 39,257,012.90/7,240.75
  6. Step 6: Final answer
    x = 5,421.68

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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.