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Finding the Fourth Proportional to 106.63, 146.18 and 104.78

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Solution

The fourth proportional to 106.63, 146.18 and 104.78 is: 143.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    106.63 : 146.18 = 104.78 : x
  2. Step 2: Convert to fraction form
    106.63/146.18 = 104.78/x
  3. Step 3: Cross multiply
    106.63x = 146.18 × 104.78
  4. Step 4: Simplify right side
    106.63x = 15,317.37
  5. Step 5: Solve for x
    x = 15,317.37/106.63
  6. Step 6: Final answer
    x = 143.65

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.