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Finding the Fourth Proportional to 413.11, 619.56 and 139.08

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Solution

The fourth proportional to 413.11, 619.56 and 139.08 is: 208.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    413.11 : 619.56 = 139.08 : x
  2. Step 2: Convert to fraction form
    413.11/619.56 = 139.08/x
  3. Step 3: Cross multiply
    413.11x = 619.56 × 139.08
  4. Step 4: Simplify right side
    413.11x = 86,170.73
  5. Step 5: Solve for x
    x = 86,170.73/413.11
  6. Step 6: Final answer
    x = 208.59

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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.