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Finding the Fourth Proportional to 678.92, 936.26 and 443.05

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Solution

The fourth proportional to 678.92, 936.26 and 443.05 is: 610.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    678.92 : 936.26 = 443.05 : x
  2. Step 2: Convert to fraction form
    678.92/936.26 = 443.05/x
  3. Step 3: Cross multiply
    678.92x = 936.26 × 443.05
  4. Step 4: Simplify right side
    678.92x = 414,808.76
  5. Step 5: Solve for x
    x = 414,808.76/678.92
  6. Step 6: Final answer
    x = 610.99

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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.