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Finding the Third Proportional to 691 and 1,513

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Solution

The third proportional to 691 and 1,513 is: 3,312.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    691 : 1,513 = 1,513 : x
  2. Step 2: Convert to fraction form
    691/1,513 = 1,513/x
  3. Step 3: Cross multiply
    691x = 1,513 × 1,513
  4. Step 4: Simplify right side
    691x = 2,289,169
  5. Step 5: Solve for x
    x = 2,289,169/691
  6. Step 6: Final answer
    x = 3,312.84

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Why These Related Problems?

These problems maintain the same ratio (2.19) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.