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Finding the Third Proportional to 135.42 and 287.72

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Solution

The third proportional to 135.42 and 287.72 is: 611.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    135.42 : 287.72 = 287.72 : x
  2. Step 2: Convert to fraction form
    135.42/287.72 = 287.72/x
  3. Step 3: Cross multiply
    135.42x = 287.72 × 287.72
  4. Step 4: Simplify right side
    135.42x = 82,782.08
  5. Step 5: Solve for x
    x = 82,782.08/135.42
  6. Step 6: Final answer
    x = 611.29

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Why These Related Problems?

These problems maintain the same ratio (2.12) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.