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Finding the Fourth Proportional to 805.29, 1,207.45 and 439.98

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Solution

The fourth proportional to 805.29, 1,207.45 and 439.98 is: 659.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    805.29 : 1,207.45 = 439.98 : x
  2. Step 2: Convert to fraction form
    805.29/1,207.45 = 439.98/x
  3. Step 3: Cross multiply
    805.29x = 1,207.45 × 439.98
  4. Step 4: Simplify right side
    805.29x = 531,253.85
  5. Step 5: Solve for x
    x = 531,253.85/805.29
  6. Step 6: Final answer
    x = 659.71

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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.