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Finding the Fourth Proportional to 678.99, 936.97 and 384.27

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Solution

The fourth proportional to 678.99, 936.97 and 384.27 is: 530.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    678.99 : 936.97 = 384.27 : x
  2. Step 2: Convert to fraction form
    678.99/936.97 = 384.27/x
  3. Step 3: Cross multiply
    678.99x = 936.97 × 384.27
  4. Step 4: Simplify right side
    678.99x = 360,049.46
  5. Step 5: Solve for x
    x = 360,049.46/678.99
  6. Step 6: Final answer
    x = 530.27

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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.