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Finding the Fourth Proportional to 121.19, 181.51 and 103.94

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Solution

The fourth proportional to 121.19, 181.51 and 103.94 is: 155.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.19 : 181.51 = 103.94 : x
  2. Step 2: Convert to fraction form
    121.19/181.51 = 103.94/x
  3. Step 3: Cross multiply
    121.19x = 181.51 × 103.94
  4. Step 4: Simplify right side
    121.19x = 18,864.98
  5. Step 5: Solve for x
    x = 18,864.98/121.19
  6. Step 6: Final answer
    x = 155.66

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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.