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Finding the Third Proportional to 356.50 and 776.75

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Solution

The third proportional to 356.50 and 776.75 is: 1,692.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    356.50 : 776.75 = 776.75 : x
  2. Step 2: Convert to fraction form
    356.50/776.75 = 776.75/x
  3. Step 3: Cross multiply
    356.50x = 776.75 × 776.75
  4. Step 4: Simplify right side
    356.50x = 603,340.56
  5. Step 5: Solve for x
    x = 603,340.56/356.50
  6. Step 6: Final answer
    x = 1,692.40

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Why These Related Problems?

These problems maintain the same ratio (2.18) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.