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Finding the Fourth Proportional to 713.15, 984.15 and 398.44

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Solution

The fourth proportional to 713.15, 984.15 and 398.44 is: 549.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    713.15 : 984.15 = 398.44 : x
  2. Step 2: Convert to fraction form
    713.15/984.15 = 398.44/x
  3. Step 3: Cross multiply
    713.15x = 984.15 × 398.44
  4. Step 4: Simplify right side
    713.15x = 392,124.73
  5. Step 5: Solve for x
    x = 392,124.73/713.15
  6. Step 6: Final answer
    x = 549.85

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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.