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Finding the Third Proportional to 408.50 and 530.75

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Solution

The third proportional to 408.50 and 530.75 is: 689.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    408.50 : 530.75 = 530.75 : x
  2. Step 2: Convert to fraction form
    408.50/530.75 = 530.75/x
  3. Step 3: Cross multiply
    408.50x = 530.75 × 530.75
  4. Step 4: Simplify right side
    408.50x = 281,695.56
  5. Step 5: Solve for x
    x = 281,695.56/408.50
  6. Step 6: Final answer
    x = 689.59

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Why These Related Problems?

These problems maintain the same ratio (1.30) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.