Home / 2,815.78-3,884.88-1,821.38

Finding the Fourth Proportional to 2,815.78, 3,884.88 and 1,821.38

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Solution

The fourth proportional to 2,815.78, 3,884.88 and 1,821.38 is: 2,512.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,815.78 : 3,884.88 = 1,821.38 : x
  2. Step 2: Convert to fraction form
    2,815.78/3,884.88 = 1,821.38/x
  3. Step 3: Cross multiply
    2,815.78x = 3,884.88 × 1,821.38
  4. Step 4: Simplify right side
    2,815.78x = 7,075,842.73
  5. Step 5: Solve for x
    x = 7,075,842.73/2,815.78
  6. Step 6: Final answer
    x = 2,512.92

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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.