Home / 3,970.80-5,478.78-2,291.67

Finding the Fourth Proportional to 3,970.80, 5,478.78 and 2,291.67

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Solution

The fourth proportional to 3,970.80, 5,478.78 and 2,291.67 is: 3,161.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,970.80 : 5,478.78 = 2,291.67 : x
  2. Step 2: Convert to fraction form
    3,970.80/5,478.78 = 2,291.67/x
  3. Step 3: Cross multiply
    3,970.80x = 5,478.78 × 2,291.67
  4. Step 4: Simplify right side
    3,970.80x = 12,555,555.76
  5. Step 5: Solve for x
    x = 12,555,555.76/3,970.80
  6. Step 6: Final answer
    x = 3,161.97

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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.