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Finding the Third Proportional to 129.88 and 285.63

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Solution

The third proportional to 129.88 and 285.63 is: 628.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.88 : 285.63 = 285.63 : x
  2. Step 2: Convert to fraction form
    129.88/285.63 = 285.63/x
  3. Step 3: Cross multiply
    129.88x = 285.63 × 285.63
  4. Step 4: Simplify right side
    129.88x = 81,581.64
  5. Step 5: Solve for x
    x = 81,581.64/129.88
  6. Step 6: Final answer
    x = 628.16

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Why These Related Problems?

These problems maintain the same ratio (2.20) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.