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Finding the Fourth Proportional to 117.20, 161.75 and 103.98

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Solution

The fourth proportional to 117.20, 161.75 and 103.98 is: 143.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    117.20 : 161.75 = 103.98 : x
  2. Step 2: Convert to fraction form
    117.20/161.75 = 103.98/x
  3. Step 3: Cross multiply
    117.20x = 161.75 × 103.98
  4. Step 4: Simplify right side
    117.20x = 16,819.05
  5. Step 5: Solve for x
    x = 16,819.05/117.20
  6. Step 6: Final answer
    x = 143.51

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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.