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Finding the Fourth Proportional to 429.86, 645.82 and 276.09

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Solution

The fourth proportional to 429.86, 645.82 and 276.09 is: 414.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    429.86 : 645.82 = 276.09 : x
  2. Step 2: Convert to fraction form
    429.86/645.82 = 276.09/x
  3. Step 3: Cross multiply
    429.86x = 645.82 × 276.09
  4. Step 4: Simplify right side
    429.86x = 178,303.75
  5. Step 5: Solve for x
    x = 178,303.75/429.86
  6. Step 6: Final answer
    x = 414.79

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.