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Finding the Third Proportional to 423.75 and 655.13

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Solution

The third proportional to 423.75 and 655.13 is: 1,012.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    423.75 : 655.13 = 655.13 : x
  2. Step 2: Convert to fraction form
    423.75/655.13 = 655.13/x
  3. Step 3: Cross multiply
    423.75x = 655.13 × 655.13
  4. Step 4: Simplify right side
    423.75x = 429,188.77
  5. Step 5: Solve for x
    x = 429,188.77/423.75
  6. Step 6: Final answer
    x = 1,012.83

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.