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Finding the Fourth Proportional to 659.49, 989 and 220.62

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Solution

The fourth proportional to 659.49, 989 and 220.62 is: 330.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    659.49 : 989 = 220.62 : x
  2. Step 2: Convert to fraction form
    659.49/989 = 220.62/x
  3. Step 3: Cross multiply
    659.49x = 989 × 220.62
  4. Step 4: Simplify right side
    659.49x = 218,193.18
  5. Step 5: Solve for x
    x = 218,193.18/659.49
  6. Step 6: Final answer
    x = 330.85

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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.