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Finding the Fourth Proportional to 745.21, 1,028.42 and 413.61

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Solution

The fourth proportional to 745.21, 1,028.42 and 413.61 is: 570.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    745.21 : 1,028.42 = 413.61 : x
  2. Step 2: Convert to fraction form
    745.21/1,028.42 = 413.61/x
  3. Step 3: Cross multiply
    745.21x = 1,028.42 × 413.61
  4. Step 4: Simplify right side
    745.21x = 425,369.69
  5. Step 5: Solve for x
    x = 425,369.69/745.21
  6. Step 6: Final answer
    x = 570.81

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.