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Finding the Fourth Proportional to 805.44, 1,207.93 and 311.79

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Solution

The fourth proportional to 805.44, 1,207.93 and 311.79 is: 467.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    805.44 : 1,207.93 = 311.79 : x
  2. Step 2: Convert to fraction form
    805.44/1,207.93 = 311.79/x
  3. Step 3: Cross multiply
    805.44x = 1,207.93 × 311.79
  4. Step 4: Simplify right side
    805.44x = 376,620.49
  5. Step 5: Solve for x
    x = 376,620.49/805.44
  6. Step 6: Final answer
    x = 467.60

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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.