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Finding the Fourth Proportional to 127.29, 175.63 and 80.65

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Solution

The fourth proportional to 127.29, 175.63 and 80.65 is: 111.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.29 : 175.63 = 80.65 : x
  2. Step 2: Convert to fraction form
    127.29/175.63 = 80.65/x
  3. Step 3: Cross multiply
    127.29x = 175.63 × 80.65
  4. Step 4: Simplify right side
    127.29x = 14,164.56
  5. Step 5: Solve for x
    x = 14,164.56/127.29
  6. Step 6: Final answer
    x = 111.28

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.