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Finding the Third Proportional to 279 and 432

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Solution

The third proportional to 279 and 432 is: 668.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    279 : 432 = 432 : x
  2. Step 2: Convert to fraction form
    279/432 = 432/x
  3. Step 3: Cross multiply
    279x = 432 × 432
  4. Step 4: Simplify right side
    279x = 186,624
  5. Step 5: Solve for x
    x = 186,624/279
  6. Step 6: Final answer
    x = 668.90

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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.