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Finding the Fourth Proportional to 121.36, 180.80 and 121.12

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Solution

The fourth proportional to 121.36, 180.80 and 121.12 is: 180.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.36 : 180.80 = 121.12 : x
  2. Step 2: Convert to fraction form
    121.36/180.80 = 121.12/x
  3. Step 3: Cross multiply
    121.36x = 180.80 × 121.12
  4. Step 4: Simplify right side
    121.36x = 21,898.50
  5. Step 5: Solve for x
    x = 21,898.50/121.36
  6. Step 6: Final answer
    x = 180.44

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.