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Finding the Fourth Proportional to 678.75, 936.51 and 384

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Solution

The fourth proportional to 678.75, 936.51 and 384 is: 529.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    678.75 : 936.51 = 384 : x
  2. Step 2: Convert to fraction form
    678.75/936.51 = 384/x
  3. Step 3: Cross multiply
    678.75x = 936.51 × 384
  4. Step 4: Simplify right side
    678.75x = 359,619.84
  5. Step 5: Solve for x
    x = 359,619.84/678.75
  6. Step 6: Final answer
    x = 529.83

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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.