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Finding the Fourth Proportional to 108.40, 163.26 and 99.03

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Solution

The fourth proportional to 108.40, 163.26 and 99.03 is: 149.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    108.40 : 163.26 = 99.03 : x
  2. Step 2: Convert to fraction form
    108.40/163.26 = 99.03/x
  3. Step 3: Cross multiply
    108.40x = 163.26 × 99.03
  4. Step 4: Simplify right side
    108.40x = 16,167.64
  5. Step 5: Solve for x
    x = 16,167.64/108.40
  6. Step 6: Final answer
    x = 149.15

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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.