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Finding the Fourth Proportional to 841.42, 1,261.29 and 321.29

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Solution

The fourth proportional to 841.42, 1,261.29 and 321.29 is: 481.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    841.42 : 1,261.29 = 321.29 : x
  2. Step 2: Convert to fraction form
    841.42/1,261.29 = 321.29/x
  3. Step 3: Cross multiply
    841.42x = 1,261.29 × 321.29
  4. Step 4: Simplify right side
    841.42x = 405,239.86
  5. Step 5: Solve for x
    x = 405,239.86/841.42
  6. Step 6: Final answer
    x = 481.61

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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.