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Finding the Fourth Proportional to 108.23, 149.38 and 66.81

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Solution

The fourth proportional to 108.23, 149.38 and 66.81 is: 92.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    108.23 : 149.38 = 66.81 : x
  2. Step 2: Convert to fraction form
    108.23/149.38 = 66.81/x
  3. Step 3: Cross multiply
    108.23x = 149.38 × 66.81
  4. Step 4: Simplify right side
    108.23x = 9,980.47
  5. Step 5: Solve for x
    x = 9,980.47/108.23
  6. Step 6: Final answer
    x = 92.22

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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.