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Finding the Fourth Proportional to 708.98, 978.36 and 394.24

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Solution

The fourth proportional to 708.98, 978.36 and 394.24 is: 544.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    708.98 : 978.36 = 394.24 : x
  2. Step 2: Convert to fraction form
    708.98/978.36 = 394.24/x
  3. Step 3: Cross multiply
    708.98x = 978.36 × 394.24
  4. Step 4: Simplify right side
    708.98x = 385,708.65
  5. Step 5: Solve for x
    x = 385,708.65/708.98
  6. Step 6: Final answer
    x = 544.03

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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.