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Finding the Fourth Proportional to 745.43, 1,028.70 and 413.87

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Solution

The fourth proportional to 745.43, 1,028.70 and 413.87 is: 571.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    745.43 : 1,028.70 = 413.87 : x
  2. Step 2: Convert to fraction form
    745.43/1,028.70 = 413.87/x
  3. Step 3: Cross multiply
    745.43x = 1,028.70 × 413.87
  4. Step 4: Simplify right side
    745.43x = 425,742.93
  5. Step 5: Solve for x
    x = 425,742.93/745.43
  6. Step 6: Final answer
    x = 571.14

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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.