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Finding the Third Proportional to 423 and 624

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Solution

The third proportional to 423 and 624 is: 920.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    423 : 624 = 624 : x
  2. Step 2: Convert to fraction form
    423/624 = 624/x
  3. Step 3: Cross multiply
    423x = 624 × 624
  4. Step 4: Simplify right side
    423x = 389,376
  5. Step 5: Solve for x
    x = 389,376/423
  6. Step 6: Final answer
    x = 920.51

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Why These Related Problems?

These problems maintain the same ratio (1.48) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.