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Finding the Fourth Proportional to 278.10, 384.30 and 212.49

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Solution

The fourth proportional to 278.10, 384.30 and 212.49 is: 293.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.10 : 384.30 = 212.49 : x
  2. Step 2: Convert to fraction form
    278.10/384.30 = 212.49/x
  3. Step 3: Cross multiply
    278.10x = 384.30 × 212.49
  4. Step 4: Simplify right side
    278.10x = 81,659.91
  5. Step 5: Solve for x
    x = 81,659.91/278.10
  6. Step 6: Final answer
    x = 293.64

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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.