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Finding the Third Proportional to 194.79 and 420.15

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Solution

The third proportional to 194.79 and 420.15 is: 906.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    194.79 : 420.15 = 420.15 : x
  2. Step 2: Convert to fraction form
    194.79/420.15 = 420.15/x
  3. Step 3: Cross multiply
    194.79x = 420.15 × 420.15
  4. Step 4: Simplify right side
    194.79x = 176,524.30
  5. Step 5: Solve for x
    x = 176,524.30/194.79
  6. Step 6: Final answer
    x = 906.24

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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.