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Finding the Fourth Proportional to 278.30, 384.40 and 223.42

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Solution

The fourth proportional to 278.30, 384.40 and 223.42 is: 308.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.30 : 384.40 = 223.42 : x
  2. Step 2: Convert to fraction form
    278.30/384.40 = 223.42/x
  3. Step 3: Cross multiply
    278.30x = 384.40 × 223.42
  4. Step 4: Simplify right side
    278.30x = 85,882.65
  5. Step 5: Solve for x
    x = 85,882.65/278.30
  6. Step 6: Final answer
    x = 308.60

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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.