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Finding the Fourth Proportional to 278.62, 384.56 and 213.02

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Solution

The fourth proportional to 278.62, 384.56 and 213.02 is: 294.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.62 : 384.56 = 213.02 : x
  2. Step 2: Convert to fraction form
    278.62/384.56 = 213.02/x
  3. Step 3: Cross multiply
    278.62x = 384.56 × 213.02
  4. Step 4: Simplify right side
    278.62x = 81,918.97
  5. Step 5: Solve for x
    x = 81,918.97/278.62
  6. Step 6: Final answer
    x = 294.02

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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.