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Finding the Fourth Proportional to 485.45, 727.80 and 331.00

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Solution

The fourth proportional to 485.45, 727.80 and 331.00 is: 496.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.45 : 727.80 = 331.00 : x
  2. Step 2: Convert to fraction form
    485.45/727.80 = 331.00/x
  3. Step 3: Cross multiply
    485.45x = 727.80 × 331.00
  4. Step 4: Simplify right side
    485.45x = 240,897.33
  5. Step 5: Solve for x
    x = 240,897.33/485.45
  6. Step 6: Final answer
    x = 496.23

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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.