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Finding the Third Proportional to 321,774 and 423,135

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Solution

The third proportional to 321,774 and 423,135 is: 556,425.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    321,774 : 423,135 = 423,135 : x
  2. Step 2: Convert to fraction form
    321,774/423,135 = 423,135/x
  3. Step 3: Cross multiply
    321,774x = 423,135 × 423,135
  4. Step 4: Simplify right side
    321,774x = 179,043,228,225
  5. Step 5: Solve for x
    x = 179,043,228,225/321,774
  6. Step 6: Final answer
    x = 556,425.40

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Why These Related Problems?

These problems maintain the same ratio (1.32) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.