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Finding the Fourth Proportional to 2,489.20, 3,733.20 and 845.72

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Solution

The fourth proportional to 2,489.20, 3,733.20 and 845.72 is: 1,268.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,489.20 : 3,733.20 = 845.72 : x
  2. Step 2: Convert to fraction form
    2,489.20/3,733.20 = 845.72/x
  3. Step 3: Cross multiply
    2,489.20x = 3,733.20 × 845.72
  4. Step 4: Simplify right side
    2,489.20x = 3,157,241.90
  5. Step 5: Solve for x
    x = 3,157,241.90/2,489.20
  6. Step 6: Final answer
    x = 1,268.38

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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.