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Finding the Fourth Proportional to 278.88, 382.08 and 259.44

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Solution

The fourth proportional to 278.88, 382.08 and 259.44 is: 355.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.88 : 382.08 = 259.44 : x
  2. Step 2: Convert to fraction form
    278.88/382.08 = 259.44/x
  3. Step 3: Cross multiply
    278.88x = 382.08 × 259.44
  4. Step 4: Simplify right side
    278.88x = 99,126.84
  5. Step 5: Solve for x
    x = 99,126.84/278.88
  6. Step 6: Final answer
    x = 355.45

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.