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Finding the Fourth Proportional to 413.11, 619.63 and 139.19

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Solution

The fourth proportional to 413.11, 619.63 and 139.19 is: 208.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    413.11 : 619.63 = 139.19 : x
  2. Step 2: Convert to fraction form
    413.11/619.63 = 139.19/x
  3. Step 3: Cross multiply
    413.11x = 619.63 × 139.19
  4. Step 4: Simplify right side
    413.11x = 86,247.50
  5. Step 5: Solve for x
    x = 86,247.50/413.11
  6. Step 6: Final answer
    x = 208.78

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Double scale
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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.