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Finding the Fourth Proportional to 1,278.82, 1,918.03 and 413.13

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Solution

The fourth proportional to 1,278.82, 1,918.03 and 413.13 is: 619.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,278.82 : 1,918.03 = 413.13 : x
  2. Step 2: Convert to fraction form
    1,278.82/1,918.03 = 413.13/x
  3. Step 3: Cross multiply
    1,278.82x = 1,918.03 × 413.13
  4. Step 4: Simplify right side
    1,278.82x = 792,395.73
  5. Step 5: Solve for x
    x = 792,395.73/1,278.82
  6. Step 6: Final answer
    x = 619.63

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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.