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Finding the Fourth Proportional to 989.20, 1,365.38 and 694.54

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Solution

The fourth proportional to 989.20, 1,365.38 and 694.54 is: 958.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.20 : 1,365.38 = 694.54 : x
  2. Step 2: Convert to fraction form
    989.20/1,365.38 = 694.54/x
  3. Step 3: Cross multiply
    989.20x = 1,365.38 × 694.54
  4. Step 4: Simplify right side
    989.20x = 948,311.03
  5. Step 5: Solve for x
    x = 948,311.03/989.20
  6. Step 6: Final answer
    x = 958.66

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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.