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Finding the Fourth Proportional to 307.30, 423.95 and 196.75

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Solution

The fourth proportional to 307.30, 423.95 and 196.75 is: 271.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    307.30 : 423.95 = 196.75 : x
  2. Step 2: Convert to fraction form
    307.30/423.95 = 196.75/x
  3. Step 3: Cross multiply
    307.30x = 423.95 × 196.75
  4. Step 4: Simplify right side
    307.30x = 83,414.24
  5. Step 5: Solve for x
    x = 83,414.24/307.30
  6. Step 6: Final answer
    x = 271.45

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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.