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Finding the Fourth Proportional to 2,855.40, 3,940.40 and 1,613.40

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Solution

The fourth proportional to 2,855.40, 3,940.40 and 1,613.40 is: 2,226.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,855.40 : 3,940.40 = 1,613.40 : x
  2. Step 2: Convert to fraction form
    2,855.40/3,940.40 = 1,613.40/x
  3. Step 3: Cross multiply
    2,855.40x = 3,940.40 × 1,613.40
  4. Step 4: Simplify right side
    2,855.40x = 6,357,441.36
  5. Step 5: Solve for x
    x = 6,357,441.36/2,855.40
  6. Step 6: Final answer
    x = 2,226.46

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1.5x scale

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.