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Finding the Third Proportional to 399 and 924

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Solution

The third proportional to 399 and 924 is: 2,139.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    399 : 924 = 924 : x
  2. Step 2: Convert to fraction form
    399/924 = 924/x
  3. Step 3: Cross multiply
    399x = 924 × 924
  4. Step 4: Simplify right side
    399x = 853,776
  5. Step 5: Solve for x
    x = 853,776/399
  6. Step 6: Final answer
    x = 2,139.79

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Why These Related Problems?

These problems maintain the same ratio (2.32) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.