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Finding the Fourth Proportional to 808.58, 1,212.16 and 321.36

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Solution

The fourth proportional to 808.58, 1,212.16 and 321.36 is: 481.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    808.58 : 1,212.16 = 321.36 : x
  2. Step 2: Convert to fraction form
    808.58/1,212.16 = 321.36/x
  3. Step 3: Cross multiply
    808.58x = 1,212.16 × 321.36
  4. Step 4: Simplify right side
    808.58x = 389,539.74
  5. Step 5: Solve for x
    x = 389,539.74/808.58
  6. Step 6: Final answer
    x = 481.76

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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.