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Finding the Third Proportional to 420,916.50 and 638,138.25

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Solution

The third proportional to 420,916.50 and 638,138.25 is: 967,461.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,916.50 : 638,138.25 = 638,138.25 : x
  2. Step 2: Convert to fraction form
    420,916.50/638,138.25 = 638,138.25/x
  3. Step 3: Cross multiply
    420,916.50x = 638,138.25 × 638,138.25
  4. Step 4: Simplify right side
    420,916.50x = 407,220,426,113.06
  5. Step 5: Solve for x
    x = 407,220,426,113.06/420,916.50
  6. Step 6: Final answer
    x = 967,461.30

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Why These Related Problems?

These problems maintain the same ratio (1.52) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.