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Finding the Fourth Proportional to 805.62, 1,206.90 and 676.47

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Solution

The fourth proportional to 805.62, 1,206.90 and 676.47 is: 1,013.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    805.62 : 1,206.90 = 676.47 : x
  2. Step 2: Convert to fraction form
    805.62/1,206.90 = 676.47/x
  3. Step 3: Cross multiply
    805.62x = 1,206.90 × 676.47
  4. Step 4: Simplify right side
    805.62x = 816,431.64
  5. Step 5: Solve for x
    x = 816,431.64/805.62
  6. Step 6: Final answer
    x = 1,013.42

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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.