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Finding the Fourth Proportional to 92.84, 128.22 and 81.16

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Solution

The fourth proportional to 92.84, 128.22 and 81.16 is: 112.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.84 : 128.22 = 81.16 : x
  2. Step 2: Convert to fraction form
    92.84/128.22 = 81.16/x
  3. Step 3: Cross multiply
    92.84x = 128.22 × 81.16
  4. Step 4: Simplify right side
    92.84x = 10,406.34
  5. Step 5: Solve for x
    x = 10,406.34/92.84
  6. Step 6: Final answer
    x = 112.09

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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.