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Finding the Fourth Proportional to 659.64, 989.51 and 220.88

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Solution

The fourth proportional to 659.64, 989.51 and 220.88 is: 331.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    659.64 : 989.51 = 220.88 : x
  2. Step 2: Convert to fraction form
    659.64/989.51 = 220.88/x
  3. Step 3: Cross multiply
    659.64x = 989.51 × 220.88
  4. Step 4: Simplify right side
    659.64x = 218,556.92
  5. Step 5: Solve for x
    x = 218,556.92/659.64
  6. Step 6: Final answer
    x = 331.33

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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.