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Finding the Fourth Proportional to 121.31, 181.71 and 73.19

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Solution

The fourth proportional to 121.31, 181.71 and 73.19 is: 109.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.31 : 181.71 = 73.19 : x
  2. Step 2: Convert to fraction form
    121.31/181.71 = 73.19/x
  3. Step 3: Cross multiply
    121.31x = 181.71 × 73.19
  4. Step 4: Simplify right side
    121.31x = 13,299.35
  5. Step 5: Solve for x
    x = 13,299.35/121.31
  6. Step 6: Final answer
    x = 109.63

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Why These Related Problems?

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