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Finding the Fourth Proportional to 108.25, 149.45 and 71.45

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Solution

The fourth proportional to 108.25, 149.45 and 71.45 is: 98.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    108.25 : 149.45 = 71.45 : x
  2. Step 2: Convert to fraction form
    108.25/149.45 = 71.45/x
  3. Step 3: Cross multiply
    108.25x = 149.45 × 71.45
  4. Step 4: Simplify right side
    108.25x = 10,677.66
  5. Step 5: Solve for x
    x = 10,677.66/108.25
  6. Step 6: Final answer
    x = 98.64

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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.