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Finding the Fourth Proportional to 121.17, 181.86 and 80.64

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Solution

The fourth proportional to 121.17, 181.86 and 80.64 is: 121.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.17 : 181.86 = 80.64 : x
  2. Step 2: Convert to fraction form
    121.17/181.86 = 80.64/x
  3. Step 3: Cross multiply
    121.17x = 181.86 × 80.64
  4. Step 4: Simplify right side
    121.17x = 14,665.19
  5. Step 5: Solve for x
    x = 14,665.19/121.17
  6. Step 6: Final answer
    x = 121.03

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.