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Finding the Fourth Proportional to 990.44, 1,485.74 and 413.64

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Solution

The fourth proportional to 990.44, 1,485.74 and 413.64 is: 620.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.44 : 1,485.74 = 413.64 : x
  2. Step 2: Convert to fraction form
    990.44/1,485.74 = 413.64/x
  3. Step 3: Cross multiply
    990.44x = 1,485.74 × 413.64
  4. Step 4: Simplify right side
    990.44x = 614,561.49
  5. Step 5: Solve for x
    x = 614,561.49/990.44
  6. Step 6: Final answer
    x = 620.49

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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.