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Finding the Fourth Proportional to 713.36, 984.45 and 398.68

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Solution

The fourth proportional to 713.36, 984.45 and 398.68 is: 550.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    713.36 : 984.45 = 398.68 : x
  2. Step 2: Convert to fraction form
    713.36/984.45 = 398.68/x
  3. Step 3: Cross multiply
    713.36x = 984.45 × 398.68
  4. Step 4: Simplify right side
    713.36x = 392,480.53
  5. Step 5: Solve for x
    x = 392,480.53/713.36
  6. Step 6: Final answer
    x = 550.19

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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.