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Finding the Fourth Proportional to 2,413.85, 3,620.87 and 770.51

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Solution

The fourth proportional to 2,413.85, 3,620.87 and 770.51 is: 1,155.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,413.85 : 3,620.87 = 770.51 : x
  2. Step 2: Convert to fraction form
    2,413.85/3,620.87 = 770.51/x
  3. Step 3: Cross multiply
    2,413.85x = 3,620.87 × 770.51
  4. Step 4: Simplify right side
    2,413.85x = 2,789,894.59
  5. Step 5: Solve for x
    x = 2,789,894.59/2,413.85
  6. Step 6: Final answer
    x = 1,155.79

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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.