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Finding the Fourth Proportional to 805.37, 1,208.14 and 285.68

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Solution

The fourth proportional to 805.37, 1,208.14 and 285.68 is: 428.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    805.37 : 1,208.14 = 285.68 : x
  2. Step 2: Convert to fraction form
    805.37/1,208.14 = 285.68/x
  3. Step 3: Cross multiply
    805.37x = 1,208.14 × 285.68
  4. Step 4: Simplify right side
    805.37x = 345,137.75
  5. Step 5: Solve for x
    x = 345,137.75/805.37
  6. Step 6: Final answer
    x = 428.55

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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.