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Finding the Third Proportional to 420.19 and 869.48

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Solution

The third proportional to 420.19 and 869.48 is: 1,799.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    420.19 : 869.48 = 869.48 : x
  2. Step 2: Convert to fraction form
    420.19/869.48 = 869.48/x
  3. Step 3: Cross multiply
    420.19x = 869.48 × 869.48
  4. Step 4: Simplify right side
    420.19x = 756,003.08
  5. Step 5: Solve for x
    x = 756,003.08/420.19
  6. Step 6: Final answer
    x = 1,799.20

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Why These Related Problems?

These problems maintain the same ratio (2.07) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.