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Finding the Third Proportional to 421.28 and 876.19

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Solution

The third proportional to 421.28 and 876.19 is: 1,822.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.28 : 876.19 = 876.19 : x
  2. Step 2: Convert to fraction form
    421.28/876.19 = 876.19/x
  3. Step 3: Cross multiply
    421.28x = 876.19 × 876.19
  4. Step 4: Simplify right side
    421.28x = 767,705.82
  5. Step 5: Solve for x
    x = 767,705.82/421.28
  6. Step 6: Final answer
    x = 1,822.34

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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.