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Finding the Fourth Proportional to 386.03, 578.78 and 190.79

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Solution

The fourth proportional to 386.03, 578.78 and 190.79 is: 286.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.03 : 578.78 = 190.79 : x
  2. Step 2: Convert to fraction form
    386.03/578.78 = 190.79/x
  3. Step 3: Cross multiply
    386.03x = 578.78 × 190.79
  4. Step 4: Simplify right side
    386.03x = 110,427.73
  5. Step 5: Solve for x
    x = 110,427.73/386.03
  6. Step 6: Final answer
    x = 286.06

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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.