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Finding the Fourth Proportional to 841.31, 1,261.68 and 321.29

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Solution

The fourth proportional to 841.31, 1,261.68 and 321.29 is: 481.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    841.31 : 1,261.68 = 321.29 : x
  2. Step 2: Convert to fraction form
    841.31/1,261.68 = 321.29/x
  3. Step 3: Cross multiply
    841.31x = 1,261.68 × 321.29
  4. Step 4: Simplify right side
    841.31x = 405,358.86
  5. Step 5: Solve for x
    x = 405,358.86/841.31
  6. Step 6: Final answer
    x = 481.82

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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.