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Finding the Fourth Proportional to 485.70, 728.17 and 331.25

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Solution

The fourth proportional to 485.70, 728.17 and 331.25 is: 496.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.70 : 728.17 = 331.25 : x
  2. Step 2: Convert to fraction form
    485.70/728.17 = 331.25/x
  3. Step 3: Cross multiply
    485.70x = 728.17 × 331.25
  4. Step 4: Simplify right side
    485.70x = 241,203.71
  5. Step 5: Solve for x
    x = 241,203.71/485.70
  6. Step 6: Final answer
    x = 496.61

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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.