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Finding the Third Proportional to 678 and 1,459.13

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Solution

The third proportional to 678 and 1,459.13 is: 3,140.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    678 : 1,459.13 = 1,459.13 : x
  2. Step 2: Convert to fraction form
    678/1,459.13 = 1,459.13/x
  3. Step 3: Cross multiply
    678x = 1,459.13 × 1,459.13
  4. Step 4: Simplify right side
    678x = 2,129,045.77
  5. Step 5: Solve for x
    x = 2,129,045.77/678
  6. Step 6: Final answer
    x = 3,140.19

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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.