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Finding the Fourth Proportional to 961.40, 1,442.10 and 413.20

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Solution

The fourth proportional to 961.40, 1,442.10 and 413.20 is: 619.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    961.40 : 1,442.10 = 413.20 : x
  2. Step 2: Convert to fraction form
    961.40/1,442.10 = 413.20/x
  3. Step 3: Cross multiply
    961.40x = 1,442.10 × 413.20
  4. Step 4: Simplify right side
    961.40x = 595,879.07
  5. Step 5: Solve for x
    x = 595,879.07/961.40
  6. Step 6: Final answer
    x = 619.80

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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.