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Finding the Third Proportional to 420.19 and 908.72

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Solution

The third proportional to 420.19 and 908.72 is: 1,965.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    420.19 : 908.72 = 908.72 : x
  2. Step 2: Convert to fraction form
    420.19/908.72 = 908.72/x
  3. Step 3: Cross multiply
    420.19x = 908.72 × 908.72
  4. Step 4: Simplify right side
    420.19x = 825,769.77
  5. Step 5: Solve for x
    x = 825,769.77/420.19
  6. Step 6: Final answer
    x = 1,965.24

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Why These Related Problems?

These problems maintain the same ratio (2.16) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.