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Finding the Fourth Proportional to 92.22, 127.28 and 78.48

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Solution

The fourth proportional to 92.22, 127.28 and 78.48 is: 108.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.22 : 127.28 = 78.48 : x
  2. Step 2: Convert to fraction form
    92.22/127.28 = 78.48/x
  3. Step 3: Cross multiply
    92.22x = 127.28 × 78.48
  4. Step 4: Simplify right side
    92.22x = 9,988.93
  5. Step 5: Solve for x
    x = 9,988.93/92.22
  6. Step 6: Final answer
    x = 108.32

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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.