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Finding the Fourth Proportional to 108.90, 149.08 and 105.41

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Solution

The fourth proportional to 108.90, 149.08 and 105.41 is: 144.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    108.90 : 149.08 = 105.41 : x
  2. Step 2: Convert to fraction form
    108.90/149.08 = 105.41/x
  3. Step 3: Cross multiply
    108.90x = 149.08 × 105.41
  4. Step 4: Simplify right side
    108.90x = 15,714.52
  5. Step 5: Solve for x
    x = 15,714.52/108.90
  6. Step 6: Final answer
    x = 144.30

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.