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Finding the Fourth Proportional to 121.44, 167.58 and 77.80

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Solution

The fourth proportional to 121.44, 167.58 and 77.80 is: 107.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.44 : 167.58 = 77.80 : x
  2. Step 2: Convert to fraction form
    121.44/167.58 = 77.80/x
  3. Step 3: Cross multiply
    121.44x = 167.58 × 77.80
  4. Step 4: Simplify right side
    121.44x = 13,037.72
  5. Step 5: Solve for x
    x = 13,037.72/121.44
  6. Step 6: Final answer
    x = 107.36

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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.