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Finding the Third Proportional to 5,136 and 7,921.75

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Solution

The third proportional to 5,136 and 7,921.75 is: 12,218.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,136 : 7,921.75 = 7,921.75 : x
  2. Step 2: Convert to fraction form
    5,136/7,921.75 = 7,921.75/x
  3. Step 3: Cross multiply
    5,136x = 7,921.75 × 7,921.75
  4. Step 4: Simplify right side
    5,136x = 62,754,123.06
  5. Step 5: Solve for x
    x = 62,754,123.06/5,136
  6. Step 6: Final answer
    x = 12,218.48

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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.