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Finding the Third Proportional to 253.69 and 279.84

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Solution

The third proportional to 253.69 and 279.84 is: 308.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    253.69 : 279.84 = 279.84 : x
  2. Step 2: Convert to fraction form
    253.69/279.84 = 279.84/x
  3. Step 3: Cross multiply
    253.69x = 279.84 × 279.84
  4. Step 4: Simplify right side
    253.69x = 78,312.52
  5. Step 5: Solve for x
    x = 78,312.52/253.69
  6. Step 6: Final answer
    x = 308.70

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Why These Related Problems?

These problems maintain the same ratio (1.10) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.