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Finding the Fourth Proportional to 386.33, 578.27 and 276.28

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Solution

The fourth proportional to 386.33, 578.27 and 276.28 is: 413.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.33 : 578.27 = 276.28 : x
  2. Step 2: Convert to fraction form
    386.33/578.27 = 276.28/x
  3. Step 3: Cross multiply
    386.33x = 578.27 × 276.28
  4. Step 4: Simplify right side
    386.33x = 159,763.68
  5. Step 5: Solve for x
    x = 159,763.68/386.33
  6. Step 6: Final answer
    x = 413.55

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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.