Home / 1,278.86-1,918.56-413.14

Finding the Fourth Proportional to 1,278.86, 1,918.56 and 413.14

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Solution

The fourth proportional to 1,278.86, 1,918.56 and 413.14 is: 619.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,278.86 : 1,918.56 = 413.14 : x
  2. Step 2: Convert to fraction form
    1,278.86/1,918.56 = 413.14/x
  3. Step 3: Cross multiply
    1,278.86x = 1,918.56 × 413.14
  4. Step 4: Simplify right side
    1,278.86x = 792,633.88
  5. Step 5: Solve for x
    x = 792,633.88/1,278.86
  6. Step 6: Final answer
    x = 619.80

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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.