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Finding the Third Proportional to 4,918 and 7,890

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Solution

The third proportional to 4,918 and 7,890 is: 12,658.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,918 : 7,890 = 7,890 : x
  2. Step 2: Convert to fraction form
    4,918/7,890 = 7,890/x
  3. Step 3: Cross multiply
    4,918x = 7,890 × 7,890
  4. Step 4: Simplify right side
    4,918x = 62,252,100
  5. Step 5: Solve for x
    x = 62,252,100/4,918
  6. Step 6: Final answer
    x = 12,658.01

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Why These Related Problems?

These problems maintain the same ratio (1.60) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.