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Finding the Fourth Proportional to 278.73, 384.39 and 223.45

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Solution

The fourth proportional to 278.73, 384.39 and 223.45 is: 308.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.73 : 384.39 = 223.45 : x
  2. Step 2: Convert to fraction form
    278.73/384.39 = 223.45/x
  3. Step 3: Cross multiply
    278.73x = 384.39 × 223.45
  4. Step 4: Simplify right side
    278.73x = 85,891.95
  5. Step 5: Solve for x
    x = 85,891.95/278.73
  6. Step 6: Final answer
    x = 308.16

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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.