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Finding the Fourth Proportional to 960.75, 1,440.14 and 413.28

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Solution

The fourth proportional to 960.75, 1,440.14 and 413.28 is: 619.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    960.75 : 1,440.14 = 413.28 : x
  2. Step 2: Convert to fraction form
    960.75/1,440.14 = 413.28/x
  3. Step 3: Cross multiply
    960.75x = 1,440.14 × 413.28
  4. Step 4: Simplify right side
    960.75x = 595,178.99
  5. Step 5: Solve for x
    x = 595,178.99/960.75
  6. Step 6: Final answer
    x = 619.49

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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.