Home / 2,857.87-4,285.72-1,215.19

Finding the Fourth Proportional to 2,857.87, 4,285.72 and 1,215.19

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Solution

The fourth proportional to 2,857.87, 4,285.72 and 1,215.19 is: 1,822.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,857.87 : 4,285.72 = 1,215.19 : x
  2. Step 2: Convert to fraction form
    2,857.87/4,285.72 = 1,215.19/x
  3. Step 3: Cross multiply
    2,857.87x = 4,285.72 × 1,215.19
  4. Step 4: Simplify right side
    2,857.87x = 5,207,964.09
  5. Step 5: Solve for x
    x = 5,207,964.09/2,857.87
  6. Step 6: Final answer
    x = 1,822.32

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.