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Finding the Fourth Proportional to 805.17, 1,205.40 and 496.09

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Solution

The fourth proportional to 805.17, 1,205.40 and 496.09 is: 742.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    805.17 : 1,205.40 = 496.09 : x
  2. Step 2: Convert to fraction form
    805.17/1,205.40 = 496.09/x
  3. Step 3: Cross multiply
    805.17x = 1,205.40 × 496.09
  4. Step 4: Simplify right side
    805.17x = 597,986.89
  5. Step 5: Solve for x
    x = 597,986.89/805.17
  6. Step 6: Final answer
    x = 742.69

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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.