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Finding the Fourth Proportional to 289.56, 399.61 and 171.61

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Solution

The fourth proportional to 289.56, 399.61 and 171.61 is: 236.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.56 : 399.61 = 171.61 : x
  2. Step 2: Convert to fraction form
    289.56/399.61 = 171.61/x
  3. Step 3: Cross multiply
    289.56x = 399.61 × 171.61
  4. Step 4: Simplify right side
    289.56x = 68,576.00
  5. Step 5: Solve for x
    x = 68,576.00/289.56
  6. Step 6: Final answer
    x = 236.83

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.