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Finding the Third Proportional to 399 and 614.50

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Solution

The third proportional to 399 and 614.50 is: 946.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    399 : 614.50 = 614.50 : x
  2. Step 2: Convert to fraction form
    399/614.50 = 614.50/x
  3. Step 3: Cross multiply
    399x = 614.50 × 614.50
  4. Step 4: Simplify right side
    399x = 377,610.25
  5. Step 5: Solve for x
    x = 377,610.25/399
  6. Step 6: Final answer
    x = 946.39

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Why These Related Problems?

These problems maintain the same ratio (1.54) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.