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Finding the Fourth Proportional to 278.83, 385.12 and 196.21

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Solution

The fourth proportional to 278.83, 385.12 and 196.21 is: 271.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.83 : 385.12 = 196.21 : x
  2. Step 2: Convert to fraction form
    278.83/385.12 = 196.21/x
  3. Step 3: Cross multiply
    278.83x = 385.12 × 196.21
  4. Step 4: Simplify right side
    278.83x = 75,564.40
  5. Step 5: Solve for x
    x = 75,564.40/278.83
  6. Step 6: Final answer
    x = 271.01

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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.