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Finding the Third Proportional to 358.88 and 778.50

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Solution

The third proportional to 358.88 and 778.50 is: 1,688.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    358.88 : 778.50 = 778.50 : x
  2. Step 2: Convert to fraction form
    358.88/778.50 = 778.50/x
  3. Step 3: Cross multiply
    358.88x = 778.50 × 778.50
  4. Step 4: Simplify right side
    358.88x = 606,062.25
  5. Step 5: Solve for x
    x = 606,062.25/358.88
  6. Step 6: Final answer
    x = 1,688.78

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Why These Related Problems?

These problems maintain the same ratio (2.17) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.