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Finding the Fourth Proportional to 159.77, 220.69 and 120.39

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Solution

The fourth proportional to 159.77, 220.69 and 120.39 is: 166.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    159.77 : 220.69 = 120.39 : x
  2. Step 2: Convert to fraction form
    159.77/220.69 = 120.39/x
  3. Step 3: Cross multiply
    159.77x = 220.69 × 120.39
  4. Step 4: Simplify right side
    159.77x = 26,568.19
  5. Step 5: Solve for x
    x = 26,568.19/159.77
  6. Step 6: Final answer
    x = 166.29

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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.