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Finding the Fourth Proportional to 413.84, 620.50 and 139.91

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Solution

The fourth proportional to 413.84, 620.50 and 139.91 is: 209.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    413.84 : 620.50 = 139.91 : x
  2. Step 2: Convert to fraction form
    413.84/620.50 = 139.91/x
  3. Step 3: Cross multiply
    413.84x = 620.50 × 139.91
  4. Step 4: Simplify right side
    413.84x = 86,814.16
  5. Step 5: Solve for x
    x = 86,814.16/413.84
  6. Step 6: Final answer
    x = 209.78

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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.