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Finding the Fourth Proportional to 307.13, 423.78 and 196.70

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Solution

The fourth proportional to 307.13, 423.78 and 196.70 is: 271.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    307.13 : 423.78 = 196.70 : x
  2. Step 2: Convert to fraction form
    307.13/423.78 = 196.70/x
  3. Step 3: Cross multiply
    307.13x = 423.78 × 196.70
  4. Step 4: Simplify right side
    307.13x = 83,355.41
  5. Step 5: Solve for x
    x = 83,355.41/307.13
  6. Step 6: Final answer
    x = 271.41

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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.