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Finding the Fourth Proportional to 857.43, 1,183.25 and 484.40

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Solution

The fourth proportional to 857.43, 1,183.25 and 484.40 is: 668.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    857.43 : 1,183.25 = 484.40 : x
  2. Step 2: Convert to fraction form
    857.43/1,183.25 = 484.40/x
  3. Step 3: Cross multiply
    857.43x = 1,183.25 × 484.40
  4. Step 4: Simplify right side
    857.43x = 573,157.96
  5. Step 5: Solve for x
    x = 573,157.96/857.43
  6. Step 6: Final answer
    x = 668.46

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.