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Finding the Fourth Proportional to 659.45, 989.08 and 197.21

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Solution

The fourth proportional to 659.45, 989.08 and 197.21 is: 295.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    659.45 : 989.08 = 197.21 : x
  2. Step 2: Convert to fraction form
    659.45/989.08 = 197.21/x
  3. Step 3: Cross multiply
    659.45x = 989.08 × 197.21
  4. Step 4: Simplify right side
    659.45x = 195,056.47
  5. Step 5: Solve for x
    x = 195,056.47/659.45
  6. Step 6: Final answer
    x = 295.79

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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.