Home / 2,115.21-2,918.94-1,231.00

Finding the Fourth Proportional to 2,115.21, 2,918.94 and 1,231.00

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Solution

The fourth proportional to 2,115.21, 2,918.94 and 1,231.00 is: 1,698.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,115.21 : 2,918.94 = 1,231.00 : x
  2. Step 2: Convert to fraction form
    2,115.21/2,918.94 = 1,231.00/x
  3. Step 3: Cross multiply
    2,115.21x = 2,918.94 × 1,231.00
  4. Step 4: Simplify right side
    2,115.21x = 3,593,203.23
  5. Step 5: Solve for x
    x = 3,593,203.23/2,115.21
  6. Step 6: Final answer
    x = 1,698.74

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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.