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Finding the Fourth Proportional to 127.56, 177.00 and 122.42

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Solution

The fourth proportional to 127.56, 177.00 and 122.42 is: 169.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.56 : 177.00 = 122.42 : x
  2. Step 2: Convert to fraction form
    127.56/177.00 = 122.42/x
  3. Step 3: Cross multiply
    127.56x = 177.00 × 122.42
  4. Step 4: Simplify right side
    127.56x = 21,666.84
  5. Step 5: Solve for x
    x = 21,666.84/127.56
  6. Step 6: Final answer
    x = 169.86

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.