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Finding the Fourth Proportional to 659.55, 989 and 220.65

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Solution

The fourth proportional to 659.55, 989 and 220.65 is: 330.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    659.55 : 989 = 220.65 : x
  2. Step 2: Convert to fraction form
    659.55/989 = 220.65/x
  3. Step 3: Cross multiply
    659.55x = 989 × 220.65
  4. Step 4: Simplify right side
    659.55x = 218,222.85
  5. Step 5: Solve for x
    x = 218,222.85/659.55
  6. Step 6: Final answer
    x = 330.87

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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.