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Finding the Fourth Proportional to 121.55, 166.62 and 121.35

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Solution

The fourth proportional to 121.55, 166.62 and 121.35 is: 166.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.55 : 166.62 = 121.35 : x
  2. Step 2: Convert to fraction form
    121.55/166.62 = 121.35/x
  3. Step 3: Cross multiply
    121.55x = 166.62 × 121.35
  4. Step 4: Simplify right side
    121.55x = 20,219.34
  5. Step 5: Solve for x
    x = 20,219.34/121.55
  6. Step 6: Final answer
    x = 166.34

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.