Home / 3,970.75-5,478.78-2,398.54

Finding the Fourth Proportional to 3,970.75, 5,478.78 and 2,398.54

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Solution

The fourth proportional to 3,970.75, 5,478.78 and 2,398.54 is: 3,309.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,970.75 : 5,478.78 = 2,398.54 : x
  2. Step 2: Convert to fraction form
    3,970.75/5,478.78 = 2,398.54/x
  3. Step 3: Cross multiply
    3,970.75x = 5,478.78 × 2,398.54
  4. Step 4: Simplify right side
    3,970.75x = 13,141,072.98
  5. Step 5: Solve for x
    x = 13,141,072.98/3,970.75
  6. Step 6: Final answer
    x = 3,309.47

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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.