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Finding the Fourth Proportional to 161.94, 223.43 and 112.80

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Solution

The fourth proportional to 161.94, 223.43 and 112.80 is: 155.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    161.94 : 223.43 = 112.80 : x
  2. Step 2: Convert to fraction form
    161.94/223.43 = 112.80/x
  3. Step 3: Cross multiply
    161.94x = 223.43 × 112.80
  4. Step 4: Simplify right side
    161.94x = 25,202.34
  5. Step 5: Solve for x
    x = 25,202.34/161.94
  6. Step 6: Final answer
    x = 155.63

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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.