Home / 1,208.12-1,812.29-386.19

Finding the Fourth Proportional to 1,208.12, 1,812.29 and 386.19

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Solution

The fourth proportional to 1,208.12, 1,812.29 and 386.19 is: 579.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,208.12 : 1,812.29 = 386.19 : x
  2. Step 2: Convert to fraction form
    1,208.12/1,812.29 = 386.19/x
  3. Step 3: Cross multiply
    1,208.12x = 1,812.29 × 386.19
  4. Step 4: Simplify right side
    1,208.12x = 699,891.98
  5. Step 5: Solve for x
    x = 699,891.98/1,208.12
  6. Step 6: Final answer
    x = 579.33

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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.