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Finding the Fourth Proportional to 193.56, 290.14 and 139.70

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Solution

The fourth proportional to 193.56, 290.14 and 139.70 is: 209.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    193.56 : 290.14 = 139.70 : x
  2. Step 2: Convert to fraction form
    193.56/290.14 = 139.70/x
  3. Step 3: Cross multiply
    193.56x = 290.14 × 139.70
  4. Step 4: Simplify right side
    193.56x = 40,532.56
  5. Step 5: Solve for x
    x = 40,532.56/193.56
  6. Step 6: Final answer
    x = 209.41

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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.