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Finding the Fourth Proportional to 194.45, 268.31 and 139.30

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Solution

The fourth proportional to 194.45, 268.31 and 139.30 is: 192.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    194.45 : 268.31 = 139.30 : x
  2. Step 2: Convert to fraction form
    194.45/268.31 = 139.30/x
  3. Step 3: Cross multiply
    194.45x = 268.31 × 139.30
  4. Step 4: Simplify right side
    194.45x = 37,375.26
  5. Step 5: Solve for x
    x = 37,375.26/194.45
  6. Step 6: Final answer
    x = 192.22

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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.