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Finding the Third Proportional to 317 and 692.50

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Solution

The third proportional to 317 and 692.50 is: 1,512.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    317 : 692.50 = 692.50 : x
  2. Step 2: Convert to fraction form
    317/692.50 = 692.50/x
  3. Step 3: Cross multiply
    317x = 692.50 × 692.50
  4. Step 4: Simplify right side
    317x = 479,556.25
  5. Step 5: Solve for x
    x = 479,556.25/317
  6. Step 6: Final answer
    x = 1,512.80

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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.