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Finding the Fourth Proportional to 608.33, 839.78 and 398.51

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Solution

The fourth proportional to 608.33, 839.78 and 398.51 is: 550.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    608.33 : 839.78 = 398.51 : x
  2. Step 2: Convert to fraction form
    608.33/839.78 = 398.51/x
  3. Step 3: Cross multiply
    608.33x = 839.78 × 398.51
  4. Step 4: Simplify right side
    608.33x = 334,660.83
  5. Step 5: Solve for x
    x = 334,660.83/608.33
  6. Step 6: Final answer
    x = 550.13

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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.