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Finding the Fourth Proportional to 1,208.39, 1,812.49 and 386.44

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Solution

The fourth proportional to 1,208.39, 1,812.49 and 386.44 is: 579.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,208.39 : 1,812.49 = 386.44 : x
  2. Step 2: Convert to fraction form
    1,208.39/1,812.49 = 386.44/x
  3. Step 3: Cross multiply
    1,208.39x = 1,812.49 × 386.44
  4. Step 4: Simplify right side
    1,208.39x = 700,425.51
  5. Step 5: Solve for x
    x = 700,425.51/1,208.39
  6. Step 6: Final answer
    x = 579.64

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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.