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Finding the Fourth Proportional to 713.28, 984.42 and 398.60

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Solution

The fourth proportional to 713.28, 984.42 and 398.60 is: 550.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    713.28 : 984.42 = 398.60 : x
  2. Step 2: Convert to fraction form
    713.28/984.42 = 398.60/x
  3. Step 3: Cross multiply
    713.28x = 984.42 × 398.60
  4. Step 4: Simplify right side
    713.28x = 392,389.81
  5. Step 5: Solve for x
    x = 392,389.81/713.28
  6. Step 6: Final answer
    x = 550.12

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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.