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Finding the Third Proportional to 31,455 and 66,048.75

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Solution

The third proportional to 31,455 and 66,048.75 is: 138,688.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,455 : 66,048.75 = 66,048.75 : x
  2. Step 2: Convert to fraction form
    31,455/66,048.75 = 66,048.75/x
  3. Step 3: Cross multiply
    31,455x = 66,048.75 × 66,048.75
  4. Step 4: Simplify right side
    31,455x = 4,362,437,376.56
  5. Step 5: Solve for x
    x = 4,362,437,376.56/31,455
  6. Step 6: Final answer
    x = 138,688.20

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Why These Related Problems?

These problems maintain the same ratio (2.10) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.