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Finding the Fourth Proportional to 678.49, 936.49 and 383.94

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Solution

The fourth proportional to 678.49, 936.49 and 383.94 is: 529.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    678.49 : 936.49 = 383.94 : x
  2. Step 2: Convert to fraction form
    678.49/936.49 = 383.94/x
  3. Step 3: Cross multiply
    678.49x = 936.49 × 383.94
  4. Step 4: Simplify right side
    678.49x = 359,550.33
  5. Step 5: Solve for x
    x = 359,550.33/678.49
  6. Step 6: Final answer
    x = 529.93

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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.