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Finding the Third Proportional to 390,060 and 618,912.75

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Solution

The third proportional to 390,060 and 618,912.75 is: 982,036.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,060 : 618,912.75 = 618,912.75 : x
  2. Step 2: Convert to fraction form
    390,060/618,912.75 = 618,912.75/x
  3. Step 3: Cross multiply
    390,060x = 618,912.75 × 618,912.75
  4. Step 4: Simplify right side
    390,060x = 383,052,992,112.56
  5. Step 5: Solve for x
    x = 383,052,992,112.56/390,060
  6. Step 6: Final answer
    x = 982,036.08

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Why These Related Problems?

These problems maintain the same ratio (1.59) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.