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Finding the Third Proportional to 291,915 and 621,495

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Solution

The third proportional to 291,915 and 621,495 is: 1,323,179.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    291,915 : 621,495 = 621,495 : x
  2. Step 2: Convert to fraction form
    291,915/621,495 = 621,495/x
  3. Step 3: Cross multiply
    291,915x = 621,495 × 621,495
  4. Step 4: Simplify right side
    291,915x = 386,256,035,025
  5. Step 5: Solve for x
    x = 386,256,035,025/291,915
  6. Step 6: Final answer
    x = 1,323,179.81

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Why These Related Problems?

These problems maintain the same ratio (2.13) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.