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Finding the Fourth Proportional to 127.26, 175.68 and 78.18

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Solution

The fourth proportional to 127.26, 175.68 and 78.18 is: 107.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.26 : 175.68 = 78.18 : x
  2. Step 2: Convert to fraction form
    127.26/175.68 = 78.18/x
  3. Step 3: Cross multiply
    127.26x = 175.68 × 78.18
  4. Step 4: Simplify right side
    127.26x = 13,734.66
  5. Step 5: Solve for x
    x = 13,734.66/127.26
  6. Step 6: Final answer
    x = 107.93

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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.