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Finding the Fourth Proportional to 805.34, 1,207.97 and 285.33

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Solution

The fourth proportional to 805.34, 1,207.97 and 285.33 is: 427.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    805.34 : 1,207.97 = 285.33 : x
  2. Step 2: Convert to fraction form
    805.34/1,207.97 = 285.33/x
  3. Step 3: Cross multiply
    805.34x = 1,207.97 × 285.33
  4. Step 4: Simplify right side
    805.34x = 344,675.68
  5. Step 5: Solve for x
    x = 344,675.68/805.34
  6. Step 6: Final answer
    x = 427.99

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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.