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Finding the Third Proportional to 288.75 and 686.44

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Solution

The third proportional to 288.75 and 686.44 is: 1,631.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.75 : 686.44 = 686.44 : x
  2. Step 2: Convert to fraction form
    288.75/686.44 = 686.44/x
  3. Step 3: Cross multiply
    288.75x = 686.44 × 686.44
  4. Step 4: Simplify right side
    288.75x = 471,196.44
  5. Step 5: Solve for x
    x = 471,196.44/288.75
  6. Step 6: Final answer
    x = 1,631.85

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Why These Related Problems?

These problems maintain the same ratio (2.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.