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Finding the Fourth Proportional to 3,220.68, 4,830.78 and 911.88

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Solution

The fourth proportional to 3,220.68, 4,830.78 and 911.88 is: 1,367.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,220.68 : 4,830.78 = 911.88 : x
  2. Step 2: Convert to fraction form
    3,220.68/4,830.78 = 911.88/x
  3. Step 3: Cross multiply
    3,220.68x = 4,830.78 × 911.88
  4. Step 4: Simplify right side
    3,220.68x = 4,405,091.67
  5. Step 5: Solve for x
    x = 4,405,091.67/3,220.68
  6. Step 6: Final answer
    x = 1,367.75

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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.