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Finding the Fourth Proportional to 165.98, 248.85 and 79.31

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Solution

The fourth proportional to 165.98, 248.85 and 79.31 is: 118.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    165.98 : 248.85 = 79.31 : x
  2. Step 2: Convert to fraction form
    165.98/248.85 = 79.31/x
  3. Step 3: Cross multiply
    165.98x = 248.85 × 79.31
  4. Step 4: Simplify right side
    165.98x = 19,736.92
  5. Step 5: Solve for x
    x = 19,736.92/165.98
  6. Step 6: Final answer
    x = 118.91

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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.