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Finding the Fourth Proportional to 713.45, 984.47 and 398.73

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Solution

The fourth proportional to 713.45, 984.47 and 398.73 is: 550.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    713.45 : 984.47 = 398.73 : x
  2. Step 2: Convert to fraction form
    713.45/984.47 = 398.73/x
  3. Step 3: Cross multiply
    713.45x = 984.47 × 398.73
  4. Step 4: Simplify right side
    713.45x = 392,537.72
  5. Step 5: Solve for x
    x = 392,537.72/713.45
  6. Step 6: Final answer
    x = 550.20

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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.