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Finding the Fourth Proportional to 193.12, 289.44 and 139.20

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Solution

The fourth proportional to 193.12, 289.44 and 139.20 is: 208.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    193.12 : 289.44 = 139.20 : x
  2. Step 2: Convert to fraction form
    193.12/289.44 = 139.20/x
  3. Step 3: Cross multiply
    193.12x = 289.44 × 139.20
  4. Step 4: Simplify right side
    193.12x = 40,290.05
  5. Step 5: Solve for x
    x = 40,290.05/193.12
  6. Step 6: Final answer
    x = 208.63

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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.