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Finding the Fourth Proportional to 278.75, 384.54 and 223.56

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Solution

The fourth proportional to 278.75, 384.54 and 223.56 is: 308.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.75 : 384.54 = 223.56 : x
  2. Step 2: Convert to fraction form
    278.75/384.54 = 223.56/x
  3. Step 3: Cross multiply
    278.75x = 384.54 × 223.56
  4. Step 4: Simplify right side
    278.75x = 85,967.76
  5. Step 5: Solve for x
    x = 85,967.76/278.75
  6. Step 6: Final answer
    x = 308.40

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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.