Home / 1,383.58-1,908.48-1,217.80

Finding the Fourth Proportional to 1,383.58, 1,908.48 and 1,217.80

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Solution

The fourth proportional to 1,383.58, 1,908.48 and 1,217.80 is: 1,679.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,383.58 : 1,908.48 = 1,217.80 : x
  2. Step 2: Convert to fraction form
    1,383.58/1,908.48 = 1,217.80/x
  3. Step 3: Cross multiply
    1,383.58x = 1,908.48 × 1,217.80
  4. Step 4: Simplify right side
    1,383.58x = 2,324,146.94
  5. Step 5: Solve for x
    x = 2,324,146.94/1,383.58
  6. Step 6: Final answer
    x = 1,679.81

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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.