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Finding the Fourth Proportional to 104.25, 143.80 and 79.65

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Solution

The fourth proportional to 104.25, 143.80 and 79.65 is: 109.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    104.25 : 143.80 = 79.65 : x
  2. Step 2: Convert to fraction form
    104.25/143.80 = 79.65/x
  3. Step 3: Cross multiply
    104.25x = 143.80 × 79.65
  4. Step 4: Simplify right side
    104.25x = 11,453.67
  5. Step 5: Solve for x
    x = 11,453.67/104.25
  6. Step 6: Final answer
    x = 109.87

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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.