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Finding the Fourth Proportional to 139.96, 210.18 and 107.80

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Solution

The fourth proportional to 139.96, 210.18 and 107.80 is: 161.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.96 : 210.18 = 107.80 : x
  2. Step 2: Convert to fraction form
    139.96/210.18 = 107.80/x
  3. Step 3: Cross multiply
    139.96x = 210.18 × 107.80
  4. Step 4: Simplify right side
    139.96x = 22,657.40
  5. Step 5: Solve for x
    x = 22,657.40/139.96
  6. Step 6: Final answer
    x = 161.88

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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.