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Finding the Third Proportional to 288.94 and 637.78

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Solution

The third proportional to 288.94 and 637.78 is: 1,407.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.94 : 637.78 = 637.78 : x
  2. Step 2: Convert to fraction form
    288.94/637.78 = 637.78/x
  3. Step 3: Cross multiply
    288.94x = 637.78 × 637.78
  4. Step 4: Simplify right side
    288.94x = 406,764.92
  5. Step 5: Solve for x
    x = 406,764.92/288.94
  6. Step 6: Final answer
    x = 1,407.80

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Why These Related Problems?

These problems maintain the same ratio (2.21) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.