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Finding the Third Proportional to 319.50 and 686.63

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Solution

The third proportional to 319.50 and 686.63 is: 1,475.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.50 : 686.63 = 686.63 : x
  2. Step 2: Convert to fraction form
    319.50/686.63 = 686.63/x
  3. Step 3: Cross multiply
    319.50x = 686.63 × 686.63
  4. Step 4: Simplify right side
    319.50x = 471,453.89
  5. Step 5: Solve for x
    x = 471,453.89/319.50
  6. Step 6: Final answer
    x = 1,475.60

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Why These Related Problems?

These problems maintain the same ratio (2.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.