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Finding the Fourth Proportional to 116.96, 161.46 and 113.72

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Solution

The fourth proportional to 116.96, 161.46 and 113.72 is: 156.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    116.96 : 161.46 = 113.72 : x
  2. Step 2: Convert to fraction form
    116.96/161.46 = 113.72/x
  3. Step 3: Cross multiply
    116.96x = 161.46 × 113.72
  4. Step 4: Simplify right side
    116.96x = 18,361.23
  5. Step 5: Solve for x
    x = 18,361.23/116.96
  6. Step 6: Final answer
    x = 156.99

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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.