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Finding the Third Proportional to 321,390 and 459,135

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Solution

The third proportional to 321,390 and 459,135 is: 655,916.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    321,390 : 459,135 = 459,135 : x
  2. Step 2: Convert to fraction form
    321,390/459,135 = 459,135/x
  3. Step 3: Cross multiply
    321,390x = 459,135 × 459,135
  4. Step 4: Simplify right side
    321,390x = 210,804,948,225
  5. Step 5: Solve for x
    x = 210,804,948,225/321,390
  6. Step 6: Final answer
    x = 655,916.33

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Why These Related Problems?

These problems maintain the same ratio (1.43) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.