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Finding the Fourth Proportional to 108.26, 149.40 and 81.98

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Solution

The fourth proportional to 108.26, 149.40 and 81.98 is: 113.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    108.26 : 149.40 = 81.98 : x
  2. Step 2: Convert to fraction form
    108.26/149.40 = 81.98/x
  3. Step 3: Cross multiply
    108.26x = 149.40 × 81.98
  4. Step 4: Simplify right side
    108.26x = 12,247.81
  5. Step 5: Solve for x
    x = 12,247.81/108.26
  6. Step 6: Final answer
    x = 113.13

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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.