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Finding the Fourth Proportional to 121.77, 181.67 and 116.31

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Solution

The fourth proportional to 121.77, 181.67 and 116.31 is: 173.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.77 : 181.67 = 116.31 : x
  2. Step 2: Convert to fraction form
    121.77/181.67 = 116.31/x
  3. Step 3: Cross multiply
    121.77x = 181.67 × 116.31
  4. Step 4: Simplify right side
    121.77x = 21,130.04
  5. Step 5: Solve for x
    x = 21,130.04/121.77
  6. Step 6: Final answer
    x = 173.52

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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.