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Finding the Third Proportional to 664 and 1,430

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Solution

The third proportional to 664 and 1,430 is: 3,079.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    664 : 1,430 = 1,430 : x
  2. Step 2: Convert to fraction form
    664/1,430 = 1,430/x
  3. Step 3: Cross multiply
    664x = 1,430 × 1,430
  4. Step 4: Simplify right side
    664x = 2,044,900
  5. Step 5: Solve for x
    x = 2,044,900/664
  6. Step 6: Final answer
    x = 3,079.67

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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.