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Finding the Third Proportional to 278.44 and 437.91

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Solution

The third proportional to 278.44 and 437.91 is: 688.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.44 : 437.91 = 437.91 : x
  2. Step 2: Convert to fraction form
    278.44/437.91 = 437.91/x
  3. Step 3: Cross multiply
    278.44x = 437.91 × 437.91
  4. Step 4: Simplify right side
    278.44x = 191,761.88
  5. Step 5: Solve for x
    x = 191,761.88/278.44
  6. Step 6: Final answer
    x = 688.71

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Why These Related Problems?

These problems maintain the same ratio (1.57) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.