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Finding the Fourth Proportional to 139.04, 191.96 and 104.72

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Solution

The fourth proportional to 139.04, 191.96 and 104.72 is: 144.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.04 : 191.96 = 104.72 : x
  2. Step 2: Convert to fraction form
    139.04/191.96 = 104.72/x
  3. Step 3: Cross multiply
    139.04x = 191.96 × 104.72
  4. Step 4: Simplify right side
    139.04x = 20,102.05
  5. Step 5: Solve for x
    x = 20,102.05/139.04
  6. Step 6: Final answer
    x = 144.58

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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.