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Finding the Third Proportional to 390.94 and 429.19

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Solution

The third proportional to 390.94 and 429.19 is: 471.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.94 : 429.19 = 429.19 : x
  2. Step 2: Convert to fraction form
    390.94/429.19 = 429.19/x
  3. Step 3: Cross multiply
    390.94x = 429.19 × 429.19
  4. Step 4: Simplify right side
    390.94x = 184,201.91
  5. Step 5: Solve for x
    x = 184,201.91/390.94
  6. Step 6: Final answer
    x = 471.18

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Why These Related Problems?

These problems maintain the same ratio (1.10) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.