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Finding the Fourth Proportional to 413.91, 620.28 and 208.20

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Solution

The fourth proportional to 413.91, 620.28 and 208.20 is: 312.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    413.91 : 620.28 = 208.20 : x
  2. Step 2: Convert to fraction form
    413.91/620.28 = 208.20/x
  3. Step 3: Cross multiply
    413.91x = 620.28 × 208.20
  4. Step 4: Simplify right side
    413.91x = 129,142.30
  5. Step 5: Solve for x
    x = 129,142.30/413.91
  6. Step 6: Final answer
    x = 312.01

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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.