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Finding the Fourth Proportional to 138.99, 190.75 and 127.95

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Solution

The fourth proportional to 138.99, 190.75 and 127.95 is: 175.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.99 : 190.75 = 127.95 : x
  2. Step 2: Convert to fraction form
    138.99/190.75 = 127.95/x
  3. Step 3: Cross multiply
    138.99x = 190.75 × 127.95
  4. Step 4: Simplify right side
    138.99x = 24,406.14
  5. Step 5: Solve for x
    x = 24,406.14/138.99
  6. Step 6: Final answer
    x = 175.60

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.