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Finding the Fourth Proportional to 961.68, 1,441.44 and 413.40

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Solution

The fourth proportional to 961.68, 1,441.44 and 413.40 is: 619.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    961.68 : 1,441.44 = 413.40 : x
  2. Step 2: Convert to fraction form
    961.68/1,441.44 = 413.40/x
  3. Step 3: Cross multiply
    961.68x = 1,441.44 × 413.40
  4. Step 4: Simplify right side
    961.68x = 595,891.30
  5. Step 5: Solve for x
    x = 595,891.30/961.68
  6. Step 6: Final answer
    x = 619.64

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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.