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Finding the Fourth Proportional to 127.24, 189.79 and 118.73

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Solution

The fourth proportional to 127.24, 189.79 and 118.73 is: 177.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.24 : 189.79 = 118.73 : x
  2. Step 2: Convert to fraction form
    127.24/189.79 = 118.73/x
  3. Step 3: Cross multiply
    127.24x = 189.79 × 118.73
  4. Step 4: Simplify right side
    127.24x = 22,533.94
  5. Step 5: Solve for x
    x = 22,533.94/127.24
  6. Step 6: Final answer
    x = 177.10

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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.