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Finding the Fourth Proportional to 126.64, 191.04 and 121.60

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Solution

The fourth proportional to 126.64, 191.04 and 121.60 is: 183.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.64 : 191.04 = 121.60 : x
  2. Step 2: Convert to fraction form
    126.64/191.04 = 121.60/x
  3. Step 3: Cross multiply
    126.64x = 191.04 × 121.60
  4. Step 4: Simplify right side
    126.64x = 23,230.46
  5. Step 5: Solve for x
    x = 23,230.46/126.64
  6. Step 6: Final answer
    x = 183.44

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.