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Finding the Fourth Proportional to 127.80, 191.69 and 50.81

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Solution

The fourth proportional to 127.80, 191.69 and 50.81 is: 76.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.80 : 191.69 = 50.81 : x
  2. Step 2: Convert to fraction form
    127.80/191.69 = 50.81/x
  3. Step 3: Cross multiply
    127.80x = 191.69 × 50.81
  4. Step 4: Simplify right side
    127.80x = 9,739.51
  5. Step 5: Solve for x
    x = 9,739.51/127.80
  6. Step 6: Final answer
    x = 76.21

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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.