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Finding the Third Proportional to 13,785 and 21,840

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Solution

The third proportional to 13,785 and 21,840 is: 34,601.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,785 : 21,840 = 21,840 : x
  2. Step 2: Convert to fraction form
    13,785/21,840 = 21,840/x
  3. Step 3: Cross multiply
    13,785x = 21,840 × 21,840
  4. Step 4: Simplify right side
    13,785x = 476,985,600
  5. Step 5: Solve for x
    x = 476,985,600/13,785
  6. Step 6: Final answer
    x = 34,601.78

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Why These Related Problems?

These problems maintain the same ratio (1.58) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.