Home / 1,279.28-1,918.60-413.36

Finding the Fourth Proportional to 1,279.28, 1,918.60 and 413.36

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Solution

The fourth proportional to 1,279.28, 1,918.60 and 413.36 is: 619.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,279.28 : 1,918.60 = 413.36 : x
  2. Step 2: Convert to fraction form
    1,279.28/1,918.60 = 413.36/x
  3. Step 3: Cross multiply
    1,279.28x = 1,918.60 × 413.36
  4. Step 4: Simplify right side
    1,279.28x = 793,072.50
  5. Step 5: Solve for x
    x = 793,072.50/1,279.28
  6. Step 6: Final answer
    x = 619.94

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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.