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Finding the Fourth Proportional to 126.72, 190.40 and 92.80

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Solution

The fourth proportional to 126.72, 190.40 and 92.80 is: 139.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.72 : 190.40 = 92.80 : x
  2. Step 2: Convert to fraction form
    126.72/190.40 = 92.80/x
  3. Step 3: Cross multiply
    126.72x = 190.40 × 92.80
  4. Step 4: Simplify right side
    126.72x = 17,669.12
  5. Step 5: Solve for x
    x = 17,669.12/126.72
  6. Step 6: Final answer
    x = 139.43

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.