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Finding the Fourth Proportional to 104.22, 143.70 and 76.62

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Solution

The fourth proportional to 104.22, 143.70 and 76.62 is: 105.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    104.22 : 143.70 = 76.62 : x
  2. Step 2: Convert to fraction form
    104.22/143.70 = 76.62/x
  3. Step 3: Cross multiply
    104.22x = 143.70 × 76.62
  4. Step 4: Simplify right side
    104.22x = 11,010.29
  5. Step 5: Solve for x
    x = 11,010.29/104.22
  6. Step 6: Final answer
    x = 105.64

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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.