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Finding the Fourth Proportional to 659.96, 989.60 and 330.54

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Solution

The fourth proportional to 659.96, 989.60 and 330.54 is: 495.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    659.96 : 989.60 = 330.54 : x
  2. Step 2: Convert to fraction form
    659.96/989.60 = 330.54/x
  3. Step 3: Cross multiply
    659.96x = 989.60 × 330.54
  4. Step 4: Simplify right side
    659.96x = 327,100.73
  5. Step 5: Solve for x
    x = 327,100.73/659.96
  6. Step 6: Final answer
    x = 495.64

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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.