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Finding the Third Proportional to 189,506 and 398,668

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Solution

The third proportional to 189,506 and 398,668 is: 838,686.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    189,506 : 398,668 = 398,668 : x
  2. Step 2: Convert to fraction form
    189,506/398,668 = 398,668/x
  3. Step 3: Cross multiply
    189,506x = 398,668 × 398,668
  4. Step 4: Simplify right side
    189,506x = 158,936,174,224
  5. Step 5: Solve for x
    x = 158,936,174,224/189,506
  6. Step 6: Final answer
    x = 838,686.77

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Why These Related Problems?

These problems maintain the same ratio (2.10) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.