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Finding the Fourth Proportional to 841.30, 1,262.10 and 321.28

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Solution

The fourth proportional to 841.30, 1,262.10 and 321.28 is: 481.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    841.30 : 1,262.10 = 321.28 : x
  2. Step 2: Convert to fraction form
    841.30/1,262.10 = 321.28/x
  3. Step 3: Cross multiply
    841.30x = 1,262.10 × 321.28
  4. Step 4: Simplify right side
    841.30x = 405,487.49
  5. Step 5: Solve for x
    x = 405,487.49/841.30
  6. Step 6: Final answer
    x = 481.98

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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.