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Finding the Fourth Proportional to 156.85, 216.62 and 122.29

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Solution

The fourth proportional to 156.85, 216.62 and 122.29 is: 168.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    156.85 : 216.62 = 122.29 : x
  2. Step 2: Convert to fraction form
    156.85/216.62 = 122.29/x
  3. Step 3: Cross multiply
    156.85x = 216.62 × 122.29
  4. Step 4: Simplify right side
    156.85x = 26,489.85
  5. Step 5: Solve for x
    x = 26,489.85/156.85
  6. Step 6: Final answer
    x = 168.89

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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.