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Finding the Fourth Proportional to 413.49, 619.80 and 139.49

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Solution

The fourth proportional to 413.49, 619.80 and 139.49 is: 209.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    413.49 : 619.80 = 139.49 : x
  2. Step 2: Convert to fraction form
    413.49/619.80 = 139.49/x
  3. Step 3: Cross multiply
    413.49x = 619.80 × 139.49
  4. Step 4: Simplify right side
    413.49x = 86,452.80
  5. Step 5: Solve for x
    x = 86,452.80/413.49
  6. Step 6: Final answer
    x = 209.08

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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.