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Finding the Fourth Proportional to 708.94, 978.22 and 394.15

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Solution

The fourth proportional to 708.94, 978.22 and 394.15 is: 543.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    708.94 : 978.22 = 394.15 : x
  2. Step 2: Convert to fraction form
    708.94/978.22 = 394.15/x
  3. Step 3: Cross multiply
    708.94x = 978.22 × 394.15
  4. Step 4: Simplify right side
    708.94x = 385,565.41
  5. Step 5: Solve for x
    x = 385,565.41/708.94
  6. Step 6: Final answer
    x = 543.86

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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.