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Finding the Fourth Proportional to 708.91, 978.32 and 394.17

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Solution

The fourth proportional to 708.91, 978.32 and 394.17 is: 543.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    708.91 : 978.32 = 394.17 : x
  2. Step 2: Convert to fraction form
    708.91/978.32 = 394.17/x
  3. Step 3: Cross multiply
    708.91x = 978.32 × 394.17
  4. Step 4: Simplify right side
    708.91x = 385,624.39
  5. Step 5: Solve for x
    x = 385,624.39/708.91
  6. Step 6: Final answer
    x = 543.97

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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.