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Finding the Fourth Proportional to 678.88, 1,018.34 and 191.94

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Solution

The fourth proportional to 678.88, 1,018.34 and 191.94 is: 287.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    678.88 : 1,018.34 = 191.94 : x
  2. Step 2: Convert to fraction form
    678.88/1,018.34 = 191.94/x
  3. Step 3: Cross multiply
    678.88x = 1,018.34 × 191.94
  4. Step 4: Simplify right side
    678.88x = 195,456.12
  5. Step 5: Solve for x
    x = 195,456.12/678.88
  6. Step 6: Final answer
    x = 287.91

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.