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Finding the Fourth Proportional to 713.62, 984.80 and 398.90

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Solution

The fourth proportional to 713.62, 984.80 and 398.90 is: 550.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    713.62 : 984.80 = 398.90 : x
  2. Step 2: Convert to fraction form
    713.62/984.80 = 398.90/x
  3. Step 3: Cross multiply
    713.62x = 984.80 × 398.90
  4. Step 4: Simplify right side
    713.62x = 392,836.29
  5. Step 5: Solve for x
    x = 392,836.29/713.62
  6. Step 6: Final answer
    x = 550.49

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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.