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Finding the Fourth Proportional to 708.73, 978.04 and 394.00

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Solution

The fourth proportional to 708.73, 978.04 and 394.00 is: 543.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    708.73 : 978.04 = 394.00 : x
  2. Step 2: Convert to fraction form
    708.73/978.04 = 394.00/x
  3. Step 3: Cross multiply
    708.73x = 978.04 × 394.00
  4. Step 4: Simplify right side
    708.73x = 385,340.90
  5. Step 5: Solve for x
    x = 385,340.90/708.73
  6. Step 6: Final answer
    x = 543.71

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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.