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Finding the Fourth Proportional to 74.22, 102.46 and 67.28

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Solution

The fourth proportional to 74.22, 102.46 and 67.28 is: 92.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.22 : 102.46 = 67.28 : x
  2. Step 2: Convert to fraction form
    74.22/102.46 = 67.28/x
  3. Step 3: Cross multiply
    74.22x = 102.46 × 67.28
  4. Step 4: Simplify right side
    74.22x = 6,893.51
  5. Step 5: Solve for x
    x = 6,893.51/74.22
  6. Step 6: Final answer
    x = 92.88

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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.