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Finding the Third Proportional to 3,875 and 7,840

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Solution

The third proportional to 3,875 and 7,840 is: 15,862.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,875 : 7,840 = 7,840 : x
  2. Step 2: Convert to fraction form
    3,875/7,840 = 7,840/x
  3. Step 3: Cross multiply
    3,875x = 7,840 × 7,840
  4. Step 4: Simplify right side
    3,875x = 61,465,600
  5. Step 5: Solve for x
    x = 61,465,600/3,875
  6. Step 6: Final answer
    x = 15,862.09

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Why These Related Problems?

These problems maintain the same ratio (2.02) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.