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Finding the Fourth Proportional to 105.34, 146.37 and 104.21

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Solution

The fourth proportional to 105.34, 146.37 and 104.21 is: 144.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    105.34 : 146.37 = 104.21 : x
  2. Step 2: Convert to fraction form
    105.34/146.37 = 104.21/x
  3. Step 3: Cross multiply
    105.34x = 146.37 × 104.21
  4. Step 4: Simplify right side
    105.34x = 15,252.70
  5. Step 5: Solve for x
    x = 15,252.70/105.34
  6. Step 6: Final answer
    x = 144.80

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.