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Finding the Fourth Proportional to 126.86, 190.28 and 54.77

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Solution

The fourth proportional to 126.86, 190.28 and 54.77 is: 82.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.86 : 190.28 = 54.77 : x
  2. Step 2: Convert to fraction form
    126.86/190.28 = 54.77/x
  3. Step 3: Cross multiply
    126.86x = 190.28 × 54.77
  4. Step 4: Simplify right side
    126.86x = 10,420.41
  5. Step 5: Solve for x
    x = 10,420.41/126.86
  6. Step 6: Final answer
    x = 82.14

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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.