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Finding the Fourth Proportional to 161.91, 223.29 and 103.68

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Solution

The fourth proportional to 161.91, 223.29 and 103.68 is: 142.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    161.91 : 223.29 = 103.68 : x
  2. Step 2: Convert to fraction form
    161.91/223.29 = 103.68/x
  3. Step 3: Cross multiply
    161.91x = 223.29 × 103.68
  4. Step 4: Simplify right side
    161.91x = 23,150.71
  5. Step 5: Solve for x
    x = 23,150.71/161.91
  6. Step 6: Final answer
    x = 142.99

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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.