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Finding the Fourth Proportional to 2,585.75, 3,879.05 and 920.39

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Solution

The fourth proportional to 2,585.75, 3,879.05 and 920.39 is: 1,380.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,585.75 : 3,879.05 = 920.39 : x
  2. Step 2: Convert to fraction form
    2,585.75/3,879.05 = 920.39/x
  3. Step 3: Cross multiply
    2,585.75x = 3,879.05 × 920.39
  4. Step 4: Simplify right side
    2,585.75x = 3,570,214.83
  5. Step 5: Solve for x
    x = 3,570,214.83/2,585.75
  6. Step 6: Final answer
    x = 1,380.73

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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.