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Finding the Fourth Proportional to 117.21, 161.67 and 105.48

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Solution

The fourth proportional to 117.21, 161.67 and 105.48 is: 145.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    117.21 : 161.67 = 105.48 : x
  2. Step 2: Convert to fraction form
    117.21/161.67 = 105.48/x
  3. Step 3: Cross multiply
    117.21x = 161.67 × 105.48
  4. Step 4: Simplify right side
    117.21x = 17,052.95
  5. Step 5: Solve for x
    x = 17,052.95/117.21
  6. Step 6: Final answer
    x = 145.49

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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.