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Finding the Fourth Proportional to 127.41, 189.77 and 126.79

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Solution

The fourth proportional to 127.41, 189.77 and 126.79 is: 188.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.41 : 189.77 = 126.79 : x
  2. Step 2: Convert to fraction form
    127.41/189.77 = 126.79/x
  3. Step 3: Cross multiply
    127.41x = 189.77 × 126.79
  4. Step 4: Simplify right side
    127.41x = 24,059.83
  5. Step 5: Solve for x
    x = 24,059.83/127.41
  6. Step 6: Final answer
    x = 188.84

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.