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Finding the Third Proportional to 686.50 and 1,507

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Solution

The third proportional to 686.50 and 1,507 is: 3,308.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    686.50 : 1,507 = 1,507 : x
  2. Step 2: Convert to fraction form
    686.50/1,507 = 1,507/x
  3. Step 3: Cross multiply
    686.50x = 1,507 × 1,507
  4. Step 4: Simplify right side
    686.50x = 2,271,049
  5. Step 5: Solve for x
    x = 2,271,049/686.50
  6. Step 6: Final answer
    x = 3,308.16

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Why These Related Problems?

These problems maintain the same ratio (2.20) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.