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Finding the Fourth Proportional to 4,855.40, 7,280.40 and 2,081.60

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Solution

The fourth proportional to 4,855.40, 7,280.40 and 2,081.60 is: 3,121.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,855.40 : 7,280.40 = 2,081.60 : x
  2. Step 2: Convert to fraction form
    4,855.40/7,280.40 = 2,081.60/x
  3. Step 3: Cross multiply
    4,855.40x = 7,280.40 × 2,081.60
  4. Step 4: Simplify right side
    4,855.40x = 15,154,880.64
  5. Step 5: Solve for x
    x = 15,154,880.64/4,855.40
  6. Step 6: Final answer
    x = 3,121.24

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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.