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Finding the Third Proportional to 420.13 and 874.25

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Solution

The third proportional to 420.13 and 874.25 is: 1,819.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    420.13 : 874.25 = 874.25 : x
  2. Step 2: Convert to fraction form
    420.13/874.25 = 874.25/x
  3. Step 3: Cross multiply
    420.13x = 874.25 × 874.25
  4. Step 4: Simplify right side
    420.13x = 764,313.06
  5. Step 5: Solve for x
    x = 764,313.06/420.13
  6. Step 6: Final answer
    x = 1,819.25

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (2.08) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.