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Finding the Third Proportional to 134.72 and 257.34

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Solution

The third proportional to 134.72 and 257.34 is: 491.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    134.72 : 257.34 = 257.34 : x
  2. Step 2: Convert to fraction form
    134.72/257.34 = 257.34/x
  3. Step 3: Cross multiply
    134.72x = 257.34 × 257.34
  4. Step 4: Simplify right side
    134.72x = 66,225.81
  5. Step 5: Solve for x
    x = 66,225.81/134.72
  6. Step 6: Final answer
    x = 491.59

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Why These Related Problems?

These problems maintain the same ratio (1.91) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.