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Finding the Fourth Proportional to 165.90, 248.75 and 79.25

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Solution

The fourth proportional to 165.90, 248.75 and 79.25 is: 118.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    165.90 : 248.75 = 79.25 : x
  2. Step 2: Convert to fraction form
    165.90/248.75 = 79.25/x
  3. Step 3: Cross multiply
    165.90x = 248.75 × 79.25
  4. Step 4: Simplify right side
    165.90x = 19,713.72
  5. Step 5: Solve for x
    x = 19,713.72/165.90
  6. Step 6: Final answer
    x = 118.83

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.