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Finding the Fourth Proportional to 108.60, 163.86 and 103.56

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Solution

The fourth proportional to 108.60, 163.86 and 103.56 is: 156.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    108.60 : 163.86 = 103.56 : x
  2. Step 2: Convert to fraction form
    108.60/163.86 = 103.56/x
  3. Step 3: Cross multiply
    108.60x = 163.86 × 103.56
  4. Step 4: Simplify right side
    108.60x = 16,969.34
  5. Step 5: Solve for x
    x = 16,969.34/108.60
  6. Step 6: Final answer
    x = 156.26

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.