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Finding the Fourth Proportional to 121.56, 167.72 and 77.96

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Solution

The fourth proportional to 121.56, 167.72 and 77.96 is: 107.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.56 : 167.72 = 77.96 : x
  2. Step 2: Convert to fraction form
    121.56/167.72 = 77.96/x
  3. Step 3: Cross multiply
    121.56x = 167.72 × 77.96
  4. Step 4: Simplify right side
    121.56x = 13,075.45
  5. Step 5: Solve for x
    x = 13,075.45/121.56
  6. Step 6: Final answer
    x = 107.56

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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.