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Finding the Fourth Proportional to 121.88, 181.66 and 116.48

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Solution

The fourth proportional to 121.88, 181.66 and 116.48 is: 173.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.88 : 181.66 = 116.48 : x
  2. Step 2: Convert to fraction form
    121.88/181.66 = 116.48/x
  3. Step 3: Cross multiply
    121.88x = 181.66 × 116.48
  4. Step 4: Simplify right side
    121.88x = 21,159.76
  5. Step 5: Solve for x
    x = 21,159.76/121.88
  6. Step 6: Final answer
    x = 173.61

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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.