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Finding the Fourth Proportional to 120.76, 181.44 and 113.47

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Solution

The fourth proportional to 120.76, 181.44 and 113.47 is: 170.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    120.76 : 181.44 = 113.47 : x
  2. Step 2: Convert to fraction form
    120.76/181.44 = 113.47/x
  3. Step 3: Cross multiply
    120.76x = 181.44 × 113.47
  4. Step 4: Simplify right side
    120.76x = 20,587.54
  5. Step 5: Solve for x
    x = 20,587.54/120.76
  6. Step 6: Final answer
    x = 170.49

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.