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Finding the Fourth Proportional to 3,213.93, 4,821.70 and 905.43

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Solution

The fourth proportional to 3,213.93, 4,821.70 and 905.43 is: 1,358.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,213.93 : 4,821.70 = 905.43 : x
  2. Step 2: Convert to fraction form
    3,213.93/4,821.70 = 905.43/x
  3. Step 3: Cross multiply
    3,213.93x = 4,821.70 × 905.43
  4. Step 4: Simplify right side
    3,213.93x = 4,365,711.83
  5. Step 5: Solve for x
    x = 4,365,711.83/3,213.93
  6. Step 6: Final answer
    x = 1,358.37

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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.