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Finding the Fourth Proportional to 92.21, 138.16 and 66.41

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Solution

The fourth proportional to 92.21, 138.16 and 66.41 is: 99.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.21 : 138.16 = 66.41 : x
  2. Step 2: Convert to fraction form
    92.21/138.16 = 66.41/x
  3. Step 3: Cross multiply
    92.21x = 138.16 × 66.41
  4. Step 4: Simplify right side
    92.21x = 9,174.18
  5. Step 5: Solve for x
    x = 9,174.18/92.21
  6. Step 6: Final answer
    x = 99.49

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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.