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Finding the Third Proportional to 643 and 1,430

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Solution

The third proportional to 643 and 1,430 is: 3,180.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    643 : 1,430 = 1,430 : x
  2. Step 2: Convert to fraction form
    643/1,430 = 1,430/x
  3. Step 3: Cross multiply
    643x = 1,430 × 1,430
  4. Step 4: Simplify right side
    643x = 2,044,900
  5. Step 5: Solve for x
    x = 2,044,900/643
  6. Step 6: Final answer
    x = 3,180.25

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Why These Related Problems?

These problems maintain the same ratio (2.22) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.