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Finding the Fourth Proportional to 4,900.80, 7,340.40 and 3,928.80

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Solution

The fourth proportional to 4,900.80, 7,340.40 and 3,928.80 is: 5,884.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,900.80 : 7,340.40 = 3,928.80 : x
  2. Step 2: Convert to fraction form
    4,900.80/7,340.40 = 3,928.80/x
  3. Step 3: Cross multiply
    4,900.80x = 7,340.40 × 3,928.80
  4. Step 4: Simplify right side
    4,900.80x = 28,838,963.52
  5. Step 5: Solve for x
    x = 28,838,963.52/4,900.80
  6. Step 6: Final answer
    x = 5,884.54

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1.5x scale

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.