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Finding the Fourth Proportional to 108.18, 149.18 and 80.51

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Solution

The fourth proportional to 108.18, 149.18 and 80.51 is: 111.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    108.18 : 149.18 = 80.51 : x
  2. Step 2: Convert to fraction form
    108.18/149.18 = 80.51/x
  3. Step 3: Cross multiply
    108.18x = 149.18 × 80.51
  4. Step 4: Simplify right side
    108.18x = 12,009.33
  5. Step 5: Solve for x
    x = 12,009.33/108.18
  6. Step 6: Final answer
    x = 111.01

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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.