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Finding the Fourth Proportional to 745.34, 1,028.55 and 413.77

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Solution

The fourth proportional to 745.34, 1,028.55 and 413.77 is: 570.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    745.34 : 1,028.55 = 413.77 : x
  2. Step 2: Convert to fraction form
    745.34/1,028.55 = 413.77/x
  3. Step 3: Cross multiply
    745.34x = 1,028.55 × 413.77
  4. Step 4: Simplify right side
    745.34x = 425,583.13
  5. Step 5: Solve for x
    x = 425,583.13/745.34
  6. Step 6: Final answer
    x = 570.99

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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.