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Finding the Third Proportional to 618.75 and 1,331.72

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Solution

The third proportional to 618.75 and 1,331.72 is: 2,866.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.75 : 1,331.72 = 1,331.72 : x
  2. Step 2: Convert to fraction form
    618.75/1,331.72 = 1,331.72/x
  3. Step 3: Cross multiply
    618.75x = 1,331.72 × 1,331.72
  4. Step 4: Simplify right side
    618.75x = 1,773,474.83
  5. Step 5: Solve for x
    x = 1,773,474.83/618.75
  6. Step 6: Final answer
    x = 2,866.22

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Why These Related Problems?

These problems maintain the same ratio (2.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.