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Finding the Fourth Proportional to 713.75, 984.96 and 399.02

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Solution

The fourth proportional to 713.75, 984.96 and 399.02 is: 550.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    713.75 : 984.96 = 399.02 : x
  2. Step 2: Convert to fraction form
    713.75/984.96 = 399.02/x
  3. Step 3: Cross multiply
    713.75x = 984.96 × 399.02
  4. Step 4: Simplify right side
    713.75x = 393,018.74
  5. Step 5: Solve for x
    x = 393,018.74/713.75
  6. Step 6: Final answer
    x = 550.64

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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.