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Finding the Fourth Proportional to 3,245.40, 4,478.94 and 1,918.44

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Solution

The fourth proportional to 3,245.40, 4,478.94 and 1,918.44 is: 2,647.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,245.40 : 4,478.94 = 1,918.44 : x
  2. Step 2: Convert to fraction form
    3,245.40/4,478.94 = 1,918.44/x
  3. Step 3: Cross multiply
    3,245.40x = 4,478.94 × 1,918.44
  4. Step 4: Simplify right side
    3,245.40x = 8,592,577.65
  5. Step 5: Solve for x
    x = 8,592,577.65/3,245.40
  6. Step 6: Final answer
    x = 2,647.62

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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.