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Finding the Fourth Proportional to 278.89, 384.89 and 208.82

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Solution

The fourth proportional to 278.89, 384.89 and 208.82 is: 288.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.89 : 384.89 = 208.82 : x
  2. Step 2: Convert to fraction form
    278.89/384.89 = 208.82/x
  3. Step 3: Cross multiply
    278.89x = 384.89 × 208.82
  4. Step 4: Simplify right side
    278.89x = 80,374.21
  5. Step 5: Solve for x
    x = 80,374.21/278.89
  6. Step 6: Final answer
    x = 288.20

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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.