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Finding the Fourth Proportional to 713.37, 984.21 and 398.58

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Solution

The fourth proportional to 713.37, 984.21 and 398.58 is: 549.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    713.37 : 984.21 = 398.58 : x
  2. Step 2: Convert to fraction form
    713.37/984.21 = 398.58/x
  3. Step 3: Cross multiply
    713.37x = 984.21 × 398.58
  4. Step 4: Simplify right side
    713.37x = 392,286.42
  5. Step 5: Solve for x
    x = 392,286.42/713.37
  6. Step 6: Final answer
    x = 549.91

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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.