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Finding the Third Proportional to 140 and 253

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Solution

The third proportional to 140 and 253 is: 457.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    140 : 253 = 253 : x
  2. Step 2: Convert to fraction form
    140/253 = 253/x
  3. Step 3: Cross multiply
    140x = 253 × 253
  4. Step 4: Simplify right side
    140x = 64,009
  5. Step 5: Solve for x
    x = 64,009/140
  6. Step 6: Final answer
    x = 457.21

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Why These Related Problems?

These problems maintain the same ratio (1.81) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.