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Finding the Fourth Proportional to 3,213.89, 4,821 and 905.57

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Solution

The fourth proportional to 3,213.89, 4,821 and 905.57 is: 1,358.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,213.89 : 4,821 = 905.57 : x
  2. Step 2: Convert to fraction form
    3,213.89/4,821 = 905.57/x
  3. Step 3: Cross multiply
    3,213.89x = 4,821 × 905.57
  4. Step 4: Simplify right side
    3,213.89x = 4,365,752.97
  5. Step 5: Solve for x
    x = 4,365,752.97/3,213.89
  6. Step 6: Final answer
    x = 1,358.40

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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.