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Finding the Fourth Proportional to 120.66, 181.71 and 105.63

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Solution

The fourth proportional to 120.66, 181.71 and 105.63 is: 159.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    120.66 : 181.71 = 105.63 : x
  2. Step 2: Convert to fraction form
    120.66/181.71 = 105.63/x
  3. Step 3: Cross multiply
    120.66x = 181.71 × 105.63
  4. Step 4: Simplify right side
    120.66x = 19,194.03
  5. Step 5: Solve for x
    x = 19,194.03/120.66
  6. Step 6: Final answer
    x = 159.08

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.