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Finding the Third Proportional to 313 and 643.50

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Solution

The third proportional to 313 and 643.50 is: 1,322.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    313 : 643.50 = 643.50 : x
  2. Step 2: Convert to fraction form
    313/643.50 = 643.50/x
  3. Step 3: Cross multiply
    313x = 643.50 × 643.50
  4. Step 4: Simplify right side
    313x = 414,092.25
  5. Step 5: Solve for x
    x = 414,092.25/313
  6. Step 6: Final answer
    x = 1,322.98

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Why These Related Problems?

These problems maintain the same ratio (2.06) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.