Home / 2,115.99-2,918.84-1,231.61

Finding the Fourth Proportional to 2,115.99, 2,918.84 and 1,231.61

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Solution

The fourth proportional to 2,115.99, 2,918.84 and 1,231.61 is: 1,698.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,115.99 : 2,918.84 = 1,231.61 : x
  2. Step 2: Convert to fraction form
    2,115.99/2,918.84 = 1,231.61/x
  3. Step 3: Cross multiply
    2,115.99x = 2,918.84 × 1,231.61
  4. Step 4: Simplify right side
    2,115.99x = 3,594,851.78
  5. Step 5: Solve for x
    x = 3,594,851.78/2,115.99
  6. Step 6: Final answer
    x = 1,698.90

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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.