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Finding the Fourth Proportional to 278.24, 384.75 and 219.92

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Solution

The fourth proportional to 278.24, 384.75 and 219.92 is: 304.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.24 : 384.75 = 219.92 : x
  2. Step 2: Convert to fraction form
    278.24/384.75 = 219.92/x
  3. Step 3: Cross multiply
    278.24x = 384.75 × 219.92
  4. Step 4: Simplify right side
    278.24x = 84,612.30
  5. Step 5: Solve for x
    x = 84,612.30/278.24
  6. Step 6: Final answer
    x = 304.10

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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.