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Finding the Fourth Proportional to 278.87, 418.31 and 73.44

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Solution

The fourth proportional to 278.87, 418.31 and 73.44 is: 110.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.87 : 418.31 = 73.44 : x
  2. Step 2: Convert to fraction form
    278.87/418.31 = 73.44/x
  3. Step 3: Cross multiply
    278.87x = 418.31 × 73.44
  4. Step 4: Simplify right side
    278.87x = 30,720.32
  5. Step 5: Solve for x
    x = 30,720.32/278.87
  6. Step 6: Final answer
    x = 110.16

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.