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Finding the Third Proportional to 355.50 and 487.75

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Solution

The third proportional to 355.50 and 487.75 is: 669.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.50 : 487.75 = 487.75 : x
  2. Step 2: Convert to fraction form
    355.50/487.75 = 487.75/x
  3. Step 3: Cross multiply
    355.50x = 487.75 × 487.75
  4. Step 4: Simplify right side
    355.50x = 237,900.06
  5. Step 5: Solve for x
    x = 237,900.06/355.50
  6. Step 6: Final answer
    x = 669.20

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.