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Finding the Fourth Proportional to 3,605.96, 4,979.78 and 2,489.78

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Solution

The fourth proportional to 3,605.96, 4,979.78 and 2,489.78 is: 3,438.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,605.96 : 4,979.78 = 2,489.78 : x
  2. Step 2: Convert to fraction form
    3,605.96/4,979.78 = 2,489.78/x
  3. Step 3: Cross multiply
    3,605.96x = 4,979.78 × 2,489.78
  4. Step 4: Simplify right side
    3,605.96x = 12,398,556.65
  5. Step 5: Solve for x
    x = 12,398,556.65/3,605.96
  6. Step 6: Final answer
    x = 3,438.35

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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.