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Finding the Fourth Proportional to 306.90, 423.40 and 196.36

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Solution

The fourth proportional to 306.90, 423.40 and 196.36 is: 270.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    306.90 : 423.40 = 196.36 : x
  2. Step 2: Convert to fraction form
    306.90/423.40 = 196.36/x
  3. Step 3: Cross multiply
    306.90x = 423.40 × 196.36
  4. Step 4: Simplify right side
    306.90x = 83,138.82
  5. Step 5: Solve for x
    x = 83,138.82/306.90
  6. Step 6: Final answer
    x = 270.90

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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.