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Finding the Fourth Proportional to 745.15, 1,028.26 and 413.55

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Solution

The fourth proportional to 745.15, 1,028.26 and 413.55 is: 570.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    745.15 : 1,028.26 = 413.55 : x
  2. Step 2: Convert to fraction form
    745.15/1,028.26 = 413.55/x
  3. Step 3: Cross multiply
    745.15x = 1,028.26 × 413.55
  4. Step 4: Simplify right side
    745.15x = 425,236.92
  5. Step 5: Solve for x
    x = 425,236.92/745.15
  6. Step 6: Final answer
    x = 570.67

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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.