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Finding the Fourth Proportional to 489.36, 674.81 and 400.19

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Solution

The fourth proportional to 489.36, 674.81 and 400.19 is: 551.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    489.36 : 674.81 = 400.19 : x
  2. Step 2: Convert to fraction form
    489.36/674.81 = 400.19/x
  3. Step 3: Cross multiply
    489.36x = 674.81 × 400.19
  4. Step 4: Simplify right side
    489.36x = 270,046.84
  5. Step 5: Solve for x
    x = 270,046.84/489.36
  6. Step 6: Final answer
    x = 551.84

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.