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Finding the Third Proportional to 390,145.50 and 838,489.50

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Solution

The third proportional to 390,145.50 and 838,489.50 is: 1,802,057.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,145.50 : 838,489.50 = 838,489.50 : x
  2. Step 2: Convert to fraction form
    390,145.50/838,489.50 = 838,489.50/x
  3. Step 3: Cross multiply
    390,145.50x = 838,489.50 × 838,489.50
  4. Step 4: Simplify right side
    390,145.50x = 703,064,641,610.25
  5. Step 5: Solve for x
    x = 703,064,641,610.25/390,145.50
  6. Step 6: Final answer
    x = 1,802,057.54

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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.