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Finding the Fourth Proportional to 108.18, 149.12 and 87.36

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Solution

The fourth proportional to 108.18, 149.12 and 87.36 is: 120.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    108.18 : 149.12 = 87.36 : x
  2. Step 2: Convert to fraction form
    108.18/149.12 = 87.36/x
  3. Step 3: Cross multiply
    108.18x = 149.12 × 87.36
  4. Step 4: Simplify right side
    108.18x = 13,027.12
  5. Step 5: Solve for x
    x = 13,027.12/108.18
  6. Step 6: Final answer
    x = 120.42

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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.