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Finding the Fourth Proportional to 1,845.60, 2,767.60 and 920.80

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Solution

The fourth proportional to 1,845.60, 2,767.60 and 920.80 is: 1,380.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,845.60 : 2,767.60 = 920.80 : x
  2. Step 2: Convert to fraction form
    1,845.60/2,767.60 = 920.80/x
  3. Step 3: Cross multiply
    1,845.60x = 2,767.60 × 920.80
  4. Step 4: Simplify right side
    1,845.60x = 2,548,406.08
  5. Step 5: Solve for x
    x = 2,548,406.08/1,845.60
  6. Step 6: Final answer
    x = 1,380.80

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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.