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Finding the Fourth Proportional to 126.10, 174.12 and 121.60

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Solution

The fourth proportional to 126.10, 174.12 and 121.60 is: 167.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.10 : 174.12 = 121.60 : x
  2. Step 2: Convert to fraction form
    126.10/174.12 = 121.60/x
  3. Step 3: Cross multiply
    126.10x = 174.12 × 121.60
  4. Step 4: Simplify right side
    126.10x = 21,172.99
  5. Step 5: Solve for x
    x = 21,172.99/126.10
  6. Step 6: Final answer
    x = 167.91

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.