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Finding the Third Proportional to 390,612 and 856,005

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Solution

The third proportional to 390,612 and 856,005 is: 1,875,888.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,612 : 856,005 = 856,005 : x
  2. Step 2: Convert to fraction form
    390,612/856,005 = 856,005/x
  3. Step 3: Cross multiply
    390,612x = 856,005 × 856,005
  4. Step 4: Simplify right side
    390,612x = 732,744,560,025
  5. Step 5: Solve for x
    x = 732,744,560,025/390,612
  6. Step 6: Final answer
    x = 1,875,888.50

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Why These Related Problems?

These problems maintain the same ratio (2.19) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.