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Finding the Fourth Proportional to 1,201.98, 1,658.79 and 678

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Solution

The fourth proportional to 1,201.98, 1,658.79 and 678 is: 935.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,201.98 : 1,658.79 = 678 : x
  2. Step 2: Convert to fraction form
    1,201.98/1,658.79 = 678/x
  3. Step 3: Cross multiply
    1,201.98x = 1,658.79 × 678
  4. Step 4: Simplify right side
    1,201.98x = 1,124,659.62
  5. Step 5: Solve for x
    x = 1,124,659.62/1,201.98
  6. Step 6: Final answer
    x = 935.67

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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.