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Finding the Third Proportional to 420 and 921.13

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Solution

The third proportional to 420 and 921.13 is: 2,020.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    420 : 921.13 = 921.13 : x
  2. Step 2: Convert to fraction form
    420/921.13 = 921.13/x
  3. Step 3: Cross multiply
    420x = 921.13 × 921.13
  4. Step 4: Simplify right side
    420x = 848,471.27
  5. Step 5: Solve for x
    x = 848,471.27/420
  6. Step 6: Final answer
    x = 2,020.17

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Why These Related Problems?

These problems maintain the same ratio (2.19) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.