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Finding the Fourth Proportional to 918.21, 1,377.31 and 268.94

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Solution

The fourth proportional to 918.21, 1,377.31 and 268.94 is: 403.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.21 : 1,377.31 = 268.94 : x
  2. Step 2: Convert to fraction form
    918.21/1,377.31 = 268.94/x
  3. Step 3: Cross multiply
    918.21x = 1,377.31 × 268.94
  4. Step 4: Simplify right side
    918.21x = 370,413.75
  5. Step 5: Solve for x
    x = 370,413.75/918.21
  6. Step 6: Final answer
    x = 403.41

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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.