Home / 2,776.98-3,828.64-1,981.21

Finding the Fourth Proportional to 2,776.98, 3,828.64 and 1,981.21

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Solution

The fourth proportional to 2,776.98, 3,828.64 and 1,981.21 is: 2,731.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,776.98 : 3,828.64 = 1,981.21 : x
  2. Step 2: Convert to fraction form
    2,776.98/3,828.64 = 1,981.21/x
  3. Step 3: Cross multiply
    2,776.98x = 3,828.64 × 1,981.21
  4. Step 4: Simplify right side
    2,776.98x = 7,585,339.85
  5. Step 5: Solve for x
    x = 7,585,339.85/2,776.98
  6. Step 6: Final answer
    x = 2,731.51

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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.