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Finding the Fourth Proportional to 678.41, 1,017.73 and 239.73

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Solution

The fourth proportional to 678.41, 1,017.73 and 239.73 is: 359.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    678.41 : 1,017.73 = 239.73 : x
  2. Step 2: Convert to fraction form
    678.41/1,017.73 = 239.73/x
  3. Step 3: Cross multiply
    678.41x = 1,017.73 × 239.73
  4. Step 4: Simplify right side
    678.41x = 243,976.90
  5. Step 5: Solve for x
    x = 243,976.90/678.41
  6. Step 6: Final answer
    x = 359.63

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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.