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Finding the Fourth Proportional to 678.44, 936.32 and 391.01

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Solution

The fourth proportional to 678.44, 936.32 and 391.01 is: 539.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    678.44 : 936.32 = 391.01 : x
  2. Step 2: Convert to fraction form
    678.44/936.32 = 391.01/x
  3. Step 3: Cross multiply
    678.44x = 936.32 × 391.01
  4. Step 4: Simplify right side
    678.44x = 366,103.85
  5. Step 5: Solve for x
    x = 366,103.85/678.44
  6. Step 6: Final answer
    x = 539.62

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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.