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Finding the Third Proportional to 5,139 and 7,939.50

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Solution

The third proportional to 5,139 and 7,939.50 is: 12,266.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,139 : 7,939.50 = 7,939.50 : x
  2. Step 2: Convert to fraction form
    5,139/7,939.50 = 7,939.50/x
  3. Step 3: Cross multiply
    5,139x = 7,939.50 × 7,939.50
  4. Step 4: Simplify right side
    5,139x = 63,035,660.25
  5. Step 5: Solve for x
    x = 63,035,660.25/5,139
  6. Step 6: Final answer
    x = 12,266.13

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Why These Related Problems?

These problems maintain the same ratio (1.54) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.