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Finding the Fourth Proportional to 117.25, 161.81 and 71.25

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Solution

The fourth proportional to 117.25, 161.81 and 71.25 is: 98.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    117.25 : 161.81 = 71.25 : x
  2. Step 2: Convert to fraction form
    117.25/161.81 = 71.25/x
  3. Step 3: Cross multiply
    117.25x = 161.81 × 71.25
  4. Step 4: Simplify right side
    117.25x = 11,528.61
  5. Step 5: Solve for x
    x = 11,528.61/117.25
  6. Step 6: Final answer
    x = 98.33

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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.