Home / 1,279.20-1,918.56-413.68

Finding the Fourth Proportional to 1,279.20, 1,918.56 and 413.68

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Solution

The fourth proportional to 1,279.20, 1,918.56 and 413.68 is: 620.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,279.20 : 1,918.56 = 413.68 : x
  2. Step 2: Convert to fraction form
    1,279.20/1,918.56 = 413.68/x
  3. Step 3: Cross multiply
    1,279.20x = 1,918.56 × 413.68
  4. Step 4: Simplify right side
    1,279.20x = 793,669.90
  5. Step 5: Solve for x
    x = 793,669.90/1,279.20
  6. Step 6: Final answer
    x = 620.44

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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.