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Finding the Third Proportional to 358.80 and 486.95

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Solution

The third proportional to 358.80 and 486.95 is: 660.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    358.80 : 486.95 = 486.95 : x
  2. Step 2: Convert to fraction form
    358.80/486.95 = 486.95/x
  3. Step 3: Cross multiply
    358.80x = 486.95 × 486.95
  4. Step 4: Simplify right side
    358.80x = 237,119.54
  5. Step 5: Solve for x
    x = 237,119.54/358.80
  6. Step 6: Final answer
    x = 660.86

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Why These Related Problems?

These problems maintain the same ratio (1.36) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.