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Finding the Fourth Proportional to 117.12, 161.17 and 108

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Solution

The fourth proportional to 117.12, 161.17 and 108 is: 148.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    117.12 : 161.17 = 108 : x
  2. Step 2: Convert to fraction form
    117.12/161.17 = 108/x
  3. Step 3: Cross multiply
    117.12x = 161.17 × 108
  4. Step 4: Simplify right side
    117.12x = 17,406.36
  5. Step 5: Solve for x
    x = 17,406.36/117.12
  6. Step 6: Final answer
    x = 148.62

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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.