Home / 1,231.25-1,698.59-811.07

Finding the Fourth Proportional to 1,231.25, 1,698.59 and 811.07

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Solution

The fourth proportional to 1,231.25, 1,698.59 and 811.07 is: 1,118.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,231.25 : 1,698.59 = 811.07 : x
  2. Step 2: Convert to fraction form
    1,231.25/1,698.59 = 811.07/x
  3. Step 3: Cross multiply
    1,231.25x = 1,698.59 × 811.07
  4. Step 4: Simplify right side
    1,231.25x = 1,377,668.93
  5. Step 5: Solve for x
    x = 1,377,668.93/1,231.25
  6. Step 6: Final answer
    x = 1,118.92

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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.