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Finding the Fourth Proportional to 2,690.60, 4,033.20 and 1,230.80

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Solution

The fourth proportional to 2,690.60, 4,033.20 and 1,230.80 is: 1,844.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,690.60 : 4,033.20 = 1,230.80 : x
  2. Step 2: Convert to fraction form
    2,690.60/4,033.20 = 1,230.80/x
  3. Step 3: Cross multiply
    2,690.60x = 4,033.20 × 1,230.80
  4. Step 4: Simplify right side
    2,690.60x = 4,964,062.56
  5. Step 5: Solve for x
    x = 4,964,062.56/2,690.60
  6. Step 6: Final answer
    x = 1,844.96

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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.