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Finding the Fourth Proportional to 3,280.40, 4,920.60 and 3,208.40

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Solution

The fourth proportional to 3,280.40, 4,920.60 and 3,208.40 is: 4,812.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,280.40 : 4,920.60 = 3,208.40 : x
  2. Step 2: Convert to fraction form
    3,280.40/4,920.60 = 3,208.40/x
  3. Step 3: Cross multiply
    3,280.40x = 4,920.60 × 3,208.40
  4. Step 4: Simplify right side
    3,280.40x = 15,787,253.04
  5. Step 5: Solve for x
    x = 15,787,253.04/3,280.40
  6. Step 6: Final answer
    x = 4,812.60

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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.