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Finding the Third Proportional to 390,209.06 and 851,139.56

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Solution

The third proportional to 390,209.06 and 851,139.56 is: 1,856,539.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,209.06 : 851,139.56 = 851,139.56 : x
  2. Step 2: Convert to fraction form
    390,209.06/851,139.56 = 851,139.56/x
  3. Step 3: Cross multiply
    390,209.06x = 851,139.56 × 851,139.56
  4. Step 4: Simplify right side
    390,209.06x = 724,438,554,852.69
  5. Step 5: Solve for x
    x = 724,438,554,852.69/390,209.06
  6. Step 6: Final answer
    x = 1,856,539.54

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Why These Related Problems?

These problems maintain the same ratio (2.18) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.