Home / 1,279.21-1,918.40-413.32

Finding the Fourth Proportional to 1,279.21, 1,918.40 and 413.32

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Solution

The fourth proportional to 1,279.21, 1,918.40 and 413.32 is: 619.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,279.21 : 1,918.40 = 413.32 : x
  2. Step 2: Convert to fraction form
    1,279.21/1,918.40 = 413.32/x
  3. Step 3: Cross multiply
    1,279.21x = 1,918.40 × 413.32
  4. Step 4: Simplify right side
    1,279.21x = 792,903.50
  5. Step 5: Solve for x
    x = 792,903.50/1,279.21
  6. Step 6: Final answer
    x = 619.84

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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.