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Finding the Fourth Proportional to 102.22, 153.44 and 76.48

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Solution

The fourth proportional to 102.22, 153.44 and 76.48 is: 114.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    102.22 : 153.44 = 76.48 : x
  2. Step 2: Convert to fraction form
    102.22/153.44 = 76.48/x
  3. Step 3: Cross multiply
    102.22x = 153.44 × 76.48
  4. Step 4: Simplify right side
    102.22x = 11,735.09
  5. Step 5: Solve for x
    x = 11,735.09/102.22
  6. Step 6: Final answer
    x = 114.80

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.