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Finding the Fourth Proportional to 805.50, 1,208.01 and 311.82

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Solution

The fourth proportional to 805.50, 1,208.01 and 311.82 is: 467.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    805.50 : 1,208.01 = 311.82 : x
  2. Step 2: Convert to fraction form
    805.50/1,208.01 = 311.82/x
  3. Step 3: Cross multiply
    805.50x = 1,208.01 × 311.82
  4. Step 4: Simplify right side
    805.50x = 376,681.68
  5. Step 5: Solve for x
    x = 376,681.68/805.50
  6. Step 6: Final answer
    x = 467.64

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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.