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Finding the Fourth Proportional to 807.97, 1,212.65 and 321.36

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Solution

The fourth proportional to 807.97, 1,212.65 and 321.36 is: 482.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    807.97 : 1,212.65 = 321.36 : x
  2. Step 2: Convert to fraction form
    807.97/1,212.65 = 321.36/x
  3. Step 3: Cross multiply
    807.97x = 1,212.65 × 321.36
  4. Step 4: Simplify right side
    807.97x = 389,698.63
  5. Step 5: Solve for x
    x = 389,698.63/807.97
  6. Step 6: Final answer
    x = 482.32

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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.